At times like this I always turn to the most excellent [LINQPad][1].

The front page of the linked site (at time of writing) immediately jumps in with stuff about SQL but don&#39;t let that obscure how powerful and flexible this tool really is. I sort of treat it like an Immediate Window on steroids. I find it invaluable for working my way through complex LINQ queries.

If you can live without intellisense it&#39;s free (the intellisense version is chargeable).


  [1]: http://www.linqpad.net/

Say that in the python shell (IDLE) I have defined some classes, functions, variables. Also created objects of the classes. Then I deleted some of the objects and created some others. At a later point in time, how can I get to know what are the currently active objects, variables, and methods definitions active in the memory?

How to get the list of all initialized objects and function definitions alive in python?

In VB.NET or C#, I&#39;m trying to read the contents of a text file that is in use by another program (that&#39;s the point, actually, I can&#39;t stop the program or it stops writing to the text file, and I want to periodically read out what is currently in the text file in another program).

This is the code I&#39;m using (VB.NET)

    Dim strContents As String
    Dim objReader As StreamReader
    objReader = New StreamReader(FullPath)
    strContents = objReader.ReadToEnd()
    objReader.Close()

Or in C#:

    var objReader = new StreamReader(FullPath);
    var strContents = objReader.ReadToEnd();
    objReader.Close();

The above, however, throws the IO exception &quot;The process cannot access the file &#39;file.txt&#39; because it is being used by another process.&quot; Are there any workarounds in this scenario?

How can I read a file even when getting an &quot;in use by another process&quot; exception?

I&#39;m debugging some tricky generic List-based code in VS 2010 - lots of hierarchy-processing etc.. Of course lambda expressions and anonymous methods aren&#39;t permitted within the immediates window and I can&#39;t be doing with stepping thru the code in the usual way as I&#39;m still trying to get my head around the hierarchies ...

Can anyone suggest a workaround or an alternative tool?

Visual Studio Immediate Window - Lambda Expressions Aren&#39;t Allowed - Is there a Work-around or Alternative?

<p>I'm debugging some tricky generic List-based code in VS 2010 - lots of hierarchy-processing etc.. Of course lambda expressions and anonymous methods aren't permitted within the immediates window and I can't be doing with stepping thru the code in the usual way as I'm still trying to get my head around the hierarchies ...</p>
<p>Can anyone suggest a workaround or an alternative tool?</p>


I am learning Java these days and I&#39;ve spent a lot of time with .NET so when I want to export or import libraries, they are usually in .dll format which is called assemblies in .NET environment and they are compiled to IL and they can have resources like images, XML, audio and so on, anyways.

I am wondering the same process in Java as well. I&#39;ve read documents but they actually confused me a little bit and to clarify things out I need your help guys.

**Questions:**

1. .NET Assembly is the same thing as Java .jar?
2. .dll contains compiled IL code and .jar contains compiled .class/byte code files?
3. They say resources, what kind of resources we are talking about here? Images, .txt files, etc. or all of them possible?

4. I&#39;ve examined AWS (Amazon Web Service API for java) and I saw three .jar file and they are 
    1. aws-java-sdk-1.1.1.jar
    2. aws-java-sdk-1.1.1-javadoc.jar
    3. aws-java-sdk-1.1.1-sources.jar

and they contain .class files - java documentation in html format and .java files which are still not compiled. So then I&#39;ve realized .jar doesn&#39;t just include compiled byte codes (.class) and also other things.

5. When I want to import java libraries, will I always need to import .jar files?
6. When I want to export my own java libraries, should I need to export in .jar file.

Thanks for help in advance.




Difference between .jar and .dll file

Maybe the question I&#39;ve stated isn&#39;t the right question, cause I already know the short answer is &quot;you can&#39;t&quot;.

&lt;h3&gt;The situation&lt;/h3&gt;
I have a base class with an overloaded constructor that takes two arguments.

    class Building
    {
        public BuildingType BuildingType { get; protected set; }
        public string Address { get; set; }
        public decimal Price { get; set; }

        public Building()
        {
            BuildingType = BuildingType.General;
            Address = &quot;Unknown&quot;;
        }

        public Building(string address, decimal price)
            : this()
        {
            Address = address;
            Price = price;
        }
    }
The class is using an enum

    enum BuildingType { None, General, Office, Apartment }

Now I want to create a child class Office which also has an overloaded constructor. This child class adds another property (Company). In this class, the BuildingType property should off course be set to Office. This is the code.

    class Office : Building
    {
        public string Company { get; set; }

        public Office()
        {
            BuildingType = BuildingType.Office;
        }

        public Office(string address, decimal price, string company)
            : base(address, price)
        {
            Company = company;
            // BuildingType = BuildingType.Office; // Don&#39;t wanna repeat statement
        }
    }

&lt;h3&gt;What I want and why&lt;/h3&gt;
I want the second constructor for the Office class to execute both the `base(address, price)` constructor as well as the default constructor of the Office class. I want to call the `base(address, price)` constructor so I don&#39;t have to repeat assigning all the properties of the base class. I want to call the default constructor of the Office class because it sets the BuildingType property to BuildingType.Office.

Now I know I can&#39;t using something like this.

    public Office(string address, decimal price, string company)
        : base(address, price) this()

&lt;h3&gt;Am I doing something wrong?&lt;/h3&gt;
I&#39;m wondering if there&#39;s something wrong with my design that makes me want to call both base(address, price) and this(). Maybe I shouldn&#39;t be setting the BuildingType in the constructor but somewhere else? I&#39;ve tried to introduce a field for this.

        public BuildingType BuildingType = BuildingType.General;

But then I can&#39;t do the same in the child class. I&#39;d be hiding the BuildingType field in the base class so I&#39;d have to use the `new` operator in the child class. I&#39;ve tried making the BuildingType in the base class `virtual`, but a field can&#39;t be made virtual.

&lt;h3&gt;Creating something in the base constructor&lt;/h3&gt;
In this simple example the default constructors only assign default values to some properties. But the Building constructor could als be creating a Foundation for the building, while the Office default constructor might create a... (can&#39;t think of something, but you get the idea). So then you&#39;d still want to execute both default constructors.

Am I thinking in the wrong direction here?

---
&lt;h3&gt;Update&lt;/h3&gt;
Based on Jon Skeet&#39;s answer and comments, here&#39;s my new code. I&#39;ve changed constructor chaining from least specific to most specific. I&#39;ve also added the `BuildingType` to the constructor of the `Building` class, made that constructor protected, and made the property setter private.

    enum BuildingType { None, General, Office, Apartment }

    class Building
    {
        private const string DefaultAddress = &quot;Unknown&quot;;

        public BuildingType BuildingType { get; private set; }
        public string Address { get; set; }
        public decimal Price { get; set; }

        #region Optional public constructors
        // Only needed if code other than subclass must 
        // be able to create a Building instance.
        // But in that case, the class itself can be abstract
        public Building() : this(DefaultAddress, 0m)
        {}

        public Building(string address, decimal price)
            : this(BuildingType.General, address, price) 
        {}
        #endregion

        protected Building(BuildingType buildingType)
            : this(buildingType, DefaultAddress, 0m) 
        {}

        protected Building(BuildingType buildingType,
            string address, decimal price)
        {
            BuildingType = buildingType;
            Address = address;
            Price = price;
        }
    }

    class Office : Building
    {
        public string Company { get; set; }

        public Office() : this(&quot;Unknown Office&quot;, 0m, null) 
        {}

        public Office(string address, decimal price, string company)
            : base(BuildingType.Office, address, price)
        {
            Company = company;
        }
    }

Can you (Jon Skeet or someone else) please comment on this revised version of the code?

One (minor) problem that isn&#39;t solved by this is that the default constructor for the Office class still needs to provide a default address (`&quot;Unknown Office&quot;` in the above code). I would still prefer to let the constructor of the base class decide on the address if one isn&#39;t specified. So this code still doesn&#39;t do _exactly_ what I want.

I could probably solve that by not using constructor chaining in the derived class, but in stead have each of it&#39;s constructors directly call the base constructor. That would mean I&#39;d change the default constructor of the `Office` class to

    public Office() : base(BuildingType.Office)

That would work for this simple example, but if there&#39;s some method I&#39;d like to execute on every instantiation of an Office, I&#39;d have to call in in all constructors. That&#39;s why constructor chaining sounds like a better idea to me.

How can I have an overloaded constructor call both the default constructor as well as an overload of the base constructor?

What member should I implement in my arbitrary structure to make the following assignment possible:

    public struct MyStruct {
       String s;
       Int length;
    }
    
    MyStruct myStruct = new MyStruct { s = &quot;Hello&quot;, length = 5 };
    
    // Now, I want the following code to set the &#39;s&#39; to &quot;Lol&quot; and the
    // length to 3 (length of &quot;Lol&quot;). The second part should be done
    // automatically.
    myStruct = &quot;Lol&quot;; // Or myStruct = String(&quot;Lol&quot;);

**How should this be done?**



How to perform struct inline initialization in C#?

&gt; **Possible Duplicate:**  
&gt; [Easiest way to compare arrays in C#](https://stackoverflow.com/questions/3232744/easiest-way-to-compare-arrays-in-c-sharp)  

&lt;!-- End of automatically inserted text --&gt;

How can I compare two arrays in C#?

I use the following code, but its result is false. I was expecting it to be true.

    Array.Equals(childe1,grandFatherNode);


How to compare arrays in C#?

Can you explain Liskov Substitution Principle (The &#39;L&#39; of SOLID) with a good C# example covering all aspects of the principle in a simplified way? If it is really possible.

Can you explain Liskov Substitution Principle with a good C# example?

I happily use the [Newtonsoft JSON library][1].
For example, I would create a `JObject` from a .NET object, in this case an instance of Exception (might or might not be a subclass) 

    if (result is Exception)
        var jobjectInstance = JObject.FromObject(result);

now I know the library can deserialize JSON text (i.e. a string) to an object

    // only works for text (string)
    Exception exception = JsonConvert.DeserializeObject&lt;Exception&gt;(jsontext); 

but what I am looking for is:

    // now i do already have an JObject instance
    Exception exception = jobjectInstance.????

Well it is clear that I can go from on `JObject` back to JSON text and then use the deserialize functionality, but that seems backwards to me.

  [1]: http://james.newtonking.com/pages/json-net.aspx

How to deserialize a JObject to .NET object

I am trying to understand difference between IQueryable, ICollection, IList &amp; IDictionary interface
which is more faster for basic operations like iterating, Indexing, Querying and more.

which class like Collection, List, Dictionary etc would be good to initiating with these interfaces and when should we be using these class. Basic advantages of using these classes over others.

I tried reading other posts with similar questions but nothing answered my full questions.
Thanks for the help.



Difference between IQueryable, ICollection, IList &amp; IDictionary interface

I&#39;ve started the very long and arduous quest to learn and **apply** TDD to my workflow. I&#39;m under the impression that TDD fits in very well with IoC principles.

After browsing some of TDD tagged questions here in SO, I read it&#39;s a good idea to program against interfaces, not objects.

Can you provide simple code examples of what this is, and how to apply it in real use cases? Simple examples is key for me (and other people wanting to learn) to grasp the concepts.

What do programmers mean when they say, &quot;Code against an interface, not an object.&quot;?

I have a custom editor template where I add values to the `ViewData` like so:

    @Html.EditorFor( model =&gt; model.PhoneNumber , new { Title = &quot;SomeValue&quot; } )

How can I access both the value and the property name?

Html.EditorFor additionalViewData

Visual Studio&#39;s MDI is currently causing me a lot of frustration. Here is my basic layout:

    +--------------+---+
    |              |   |
    |      1       |   |
    |              |   |
    |              | 3 |
    +--------------+   |
    |      2       |   |
    +--------------+---+

Pretty standard - I have my open files in area 1, my errors window in area 2, and my solution explorer in area 3.

The main source of my frustration is that when I double click to open a file from the solution explorer, it will usually open in area 1 where it should, but SOMETIMES (seemingly at random) it will open in area 2, meaning I have to drag it up to area 1 to see it properly.  Or, more rarely, it might even open in a completely new pane between areas 1 and 3.

Further, if I close all my files, area 2 will expand to take up the whole left column, and new files will open in this new combined pane, which again is annoying.  Or, they maybe not, depending on what mood VS is in today.

No one else in our office of 20 seems to have this problem, but similarly no one seems to know how to fix it. So:

 1. I want to make it so files I open always open into area 1.
 2. I wonder if it is possible to be able to &quot;lock&quot; my layout (eg. like I can with the Windows Task Bar), to stop me from accidentally moving or resizing panes.

Visual Studio 2010 annoyingly opens documents in wrong MDI pane

I just open a console application and I type

    Console.WriteLine(&quot;Test&quot;);

But the output window doesn&#39;t show this. I go to the output window with &lt;kbd&gt;Ctrl&lt;/kbd&gt; + &lt;kbd&gt;W&lt;/kbd&gt;, &lt;kbd&gt;O&lt;/kbd&gt;.

But nothing shows up when I run my program. Am I nuts or is this not supported in [Visual&amp;nbsp;Studio&amp;nbsp;2010 Express][1]?

  [1]: https://en.wikipedia.org/wiki/Microsoft_Visual_Studio_Express



Why doesn&#39;t Console.Writeline, Console.Write work in Visual Studio Express?

I have error from visual studio 2010:

&gt; Error	1	The item &quot;CrossDomainService.svc.cs&quot; was specified more than once in the &quot;Sources&quot; parameter.  Duplicate items are not supported by the &quot;Sources&quot; parameter.	WcfServiceDomain

and from msbuild 

&gt;   C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.CSharp.targets(160,9)
: error MSB3105: The item &quot;CrossDomainService.svc.cs&quot; was specified more than o
nce in the &quot;Sources&quot; parameter.  Duplicate items are not supported by the &quot;Sources&quot; parameter. [C:\inetpub\Wwwroot\axaptaWcfConnection\WcfServiceDomain\WcfSer
viceDomain.csproj]


My file is csproj:


        &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;Project ToolsVersion=&quot;4.0&quot; xmlns=&quot;http://schemas.microsoft.com/developer/msbuild/2003&quot;&gt;
      &lt;Import Project=&quot;$(MSBuildToolsPath)\Microsoft.CSharp.targets&quot; /&gt;
      &lt;PropertyGroup&gt;
        &lt;Configuration Condition=&quot; &#39;$(Configuration)&#39; == &#39;&#39; &quot;&gt;Debug&lt;/Configuration&gt;
        &lt;Platform Condition=&quot; &#39;$(Platform)&#39; == &#39;&#39; &quot;&gt;AnyCPU&lt;/Platform&gt;
        &lt;ProductVersion&gt;
        &lt;/ProductVersion&gt;
        &lt;SchemaVersion&gt;2.0&lt;/SchemaVersion&gt;
        &lt;ProjectGuid&gt;{8D40933A-E036-4CD0-9003-314A692724D5}&lt;/ProjectGuid&gt;
        &lt;ProjectTypeGuids&gt;{349c5851-65df-11da-9384-00065b846f21};{fae04ec0-301f-11d3-bf4b-00c04f79efbc}&lt;/ProjectTypeGuids&gt;
        &lt;OutputType&gt;Library&lt;/OutputType&gt;
        &lt;AppDesignerFolder&gt;Properties&lt;/AppDesignerFolder&gt;
        &lt;RootNamespace&gt;WcfServiceDomain&lt;/RootNamespace&gt;
        &lt;AssemblyName&gt;WcfServiceDomain&lt;/AssemblyName&gt;
        &lt;TargetFrameworkVersion&gt;v4.0&lt;/TargetFrameworkVersion&gt;
        &lt;TargetFrameworkProfile /&gt;
        &lt;FileUpgradeFlags&gt;
        &lt;/FileUpgradeFlags&gt;
        &lt;UpgradeBackupLocation&gt;
        &lt;/UpgradeBackupLocation&gt;
        &lt;OldToolsVersion&gt;4.0&lt;/OldToolsVersion&gt;
      &lt;/PropertyGroup&gt;
      &lt;PropertyGroup Condition=&quot; &#39;$(Configuration)|$(Platform)&#39; == &#39;Debug|AnyCPU&#39; &quot;&gt;
        &lt;DebugSymbols&gt;true&lt;/DebugSymbols&gt;
        &lt;DebugType&gt;full&lt;/DebugType&gt;
        &lt;Optimize&gt;false&lt;/Optimize&gt;
        &lt;OutputPath&gt;bin\&lt;/OutputPath&gt;
        &lt;DefineConstants&gt;DEBUG;TRACE&lt;/DefineConstants&gt;
        &lt;ErrorReport&gt;prompt&lt;/ErrorReport&gt;
        &lt;WarningLevel&gt;4&lt;/WarningLevel&gt;
        &lt;PlatformTarget&gt;x86&lt;/PlatformTarget&gt;
      &lt;/PropertyGroup&gt;
      &lt;PropertyGroup Condition=&quot; &#39;$(Configuration)|$(Platform)&#39; == &#39;Release|AnyCPU&#39; &quot;&gt;
        &lt;DebugType&gt;pdbonly&lt;/DebugType&gt;
        &lt;Optimize&gt;true&lt;/Optimize&gt;
        &lt;OutputPath&gt;bin\&lt;/OutputPath&gt;
        &lt;DefineConstants&gt;TRACE&lt;/DefineConstants&gt;
        &lt;ErrorReport&gt;prompt&lt;/ErrorReport&gt;
        &lt;WarningLevel&gt;4&lt;/WarningLevel&gt;
      &lt;/PropertyGroup&gt;
      &lt;ItemGroup&gt;
        &lt;Reference Include=&quot;System.Web.ApplicationServices&quot; /&gt;
        &lt;Reference Include=&quot;System.Web.DynamicData&quot; /&gt;
        &lt;Reference Include=&quot;System.Web.Entity&quot; /&gt;
        &lt;Reference Include=&quot;System.Configuration&quot; /&gt;
        &lt;Reference Include=&quot;System.Drawing&quot; /&gt;
        &lt;Reference Include=&quot;System.EnterpriseServices&quot; /&gt;
        &lt;Reference Include=&quot;System.Runtime.Serialization&quot; /&gt;
        &lt;Reference Include=&quot;System.ServiceModel&quot; /&gt;
        &lt;Reference Include=&quot;System.ServiceModel.Web&quot; /&gt;
        &lt;Reference Include=&quot;System.Web.Services&quot; /&gt;
      &lt;/ItemGroup&gt;
      &lt;ItemGroup&gt;
        &lt;Content Include=&quot;ClientAccessPolicy.xml&quot; /&gt;
        &lt;Content Include=&quot;CrossDomainService.svc&quot; /&gt;
        &lt;Content Include=&quot;Service1.svc&quot; /&gt;
        &lt;Content Include=&quot;Web.config&quot;&gt;
          &lt;SubType&gt;Designer&lt;/SubType&gt;
        &lt;/Content&gt;
        &lt;Content Include=&quot;Web.Debug.config&quot;&gt;
          &lt;DependentUpon&gt;Web.config&lt;/DependentUpon&gt;
        &lt;/Content&gt;
        &lt;Content Include=&quot;Web.Release.config&quot;&gt;
          &lt;DependentUpon&gt;Web.config&lt;/DependentUpon&gt;
        &lt;/Content&gt;
      &lt;/ItemGroup&gt;
      &lt;ItemGroup&gt;
        &lt;Compile Include=&quot;CrossDomainService.svc.cs&quot;&gt;
          &lt;DependentUpon&gt;CrossDomainService.svc&lt;/DependentUpon&gt;
        &lt;/Compile&gt;
        &lt;Compile Include=&quot;ICrossDomainService.cs&quot; /&gt;
        &lt;Compile Include=&quot;Service1.svc.cs&quot;&gt;
          &lt;DependentUpon&gt;Service1.svc&lt;/DependentUpon&gt;
        &lt;/Compile&gt;
        &lt;Compile Include=&quot;IService1.cs&quot; /&gt;
        &lt;Compile Include=&quot;Properties\AssemblyInfo.cs&quot; /&gt;
      &lt;/ItemGroup&gt;
      &lt;ProjectExtensions&gt;
        &lt;VisualStudio&gt;
          &lt;FlavorProperties GUID=&quot;{349c5851-65df-11da-9384-00065b846f21}&quot;&gt;
            &lt;WebProjectProperties&gt;
              &lt;UseIIS&gt;False&lt;/UseIIS&gt;
              &lt;AutoAssignPort&gt;True&lt;/AutoAssignPort&gt;
              &lt;DevelopmentServerPort&gt;51421&lt;/DevelopmentServerPort&gt;
              &lt;DevelopmentServerVPath&gt;/&lt;/DevelopmentServerVPath&gt;
              &lt;IISUrl&gt;
              &lt;/IISUrl&gt;
              &lt;NTLMAuthentication&gt;False&lt;/NTLMAuthentication&gt;
              &lt;UseCustomServer&gt;False&lt;/UseCustomServer&gt;
              &lt;CustomServerUrl&gt;
              &lt;/CustomServerUrl&gt;
              &lt;SaveServerSettingsInUserFile&gt;False&lt;/SaveServerSettingsInUserFile&gt;
            &lt;/WebProjectProperties&gt;
          &lt;/FlavorProperties&gt;
        &lt;/VisualStudio&gt;
      &lt;/ProjectExtensions&gt;
      &lt;Import Project=&quot;$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v10.0\WebApplications\Microsoft.WebApplication.targets&quot; /&gt;
    &lt;/Project&gt;


I not see any duplicate :/ Any idea from this error ?? 

error in csproj - duplicate item

How do you compile assembly code using Visual Studio?

I want to compile and run an assembly source file in [Visual&amp;nbsp;Studio&amp;nbsp;2010][1].

I&#39;ve created a Visual C++ project and inserted some assembly code in a file `code.asm`:

    .586              ;Target processor.  Use instructions for Pentium class machines
    .MODEL FLAT, C    ;Use the flat memory model. Use C calling conventions
    .STACK            ;Define a stack segment of 1KB (Not required for this example)
    .DATA             ;Create a near data segment.  Local variables are declared after
                      ;this directive (Not required for this example)
    .CODE             ;Indicates the start of a code segment.
    
    clear PROC
       xor eax, eax 
       xor ebx, ebx 
       ret 
    clear ENDP 
    END

However the problem is when you try and compile this, you get:

    LINK : error LNK2001: unresolved external symbol _mainCRTStartup

I did go and enable the build customization `masm.targets` (right click project &amp;gt; Build Customizations..), but to no avail.

  [1]: http://en.wikipedia.org/wiki/Microsoft_Visual_Studio#Visual_Studio_2010


Compiling assembly in Visual Studio


1. What is the difference between jagged array and Multidimensional array.
Is there a benefit of one on another?

2. And why would the Visual Studio not allow me to do a 

        MyClass[][] abc = new MyClass[10][20];

    (We used to do that in C++, but in C# it underlines [20] with red wriggly line.. Says invalid rank specifier)

    but is happy with 

        MyClass[,] abc = new MyClass[10,20];

3. Finally how can I initialize this in a single line (like we do in simple array with `{new xxx...}{new xxx....}`)

        MyClass[][,][,] itemscollection;



Why we have both jagged array and multidimensional array?

I&#39;ve seen many articles about how to overcome this matter, all related to CTP4, Or adding my own extension methods.

Is there an &quot;official&quot; EF4 included way to use lambda expressions inside include (for both first level relations and also 2nd and more level) or is it eventually was not included in the RTM ? 

It there is one - I would be glad to learn how to do it, as using lambda expression in my code now (with #system.data.entity #system.data.linq) still gives me: 

Cannot convert lambda expression to type &#39;string&#39; because it is not a delegate type	
on: 

&lt;!-- language: c# --&gt;

    var customers = from c in
    context.Customers.Include(c=&gt;c.Phone)


Using Include in Entity Framework 4 with lambda expressions

I wonder if it&#39;s possible to write a function that returns a lambda function in C++11. Of course one problem is how to declare such function. Each lambda has a type, but that type is not expressible in C++. I don&#39;t think this would work:

    auto retFun() -&gt; decltype ([](int x) -&gt; int)
    {
        return [](int x) { return x; }
    }
Nor this:

    int(int) retFun();
I&#39;m not aware of any automatic conversions from lambdas to, say, pointers to functions, or some such. Is the only solution handcrafting a function object and returning it? 

Function returning a lambda expression

I&#39;m trying to call `System.Windows.Threading.Dispatcher.BeginInvoke`. The signature of the method is this:

    BeginInvoke(Delegate method, params object[] args)

I&#39;m trying to pass it a Lambda instead of having to create a Delegate.

    _dispatcher.BeginInvoke((sender) =&gt; { DoSomething(); }, new object[] { this } );

It&#39;s giving me a compiler error saying that I 

&gt; can&#39;t convert the lambda to a System.Delegate. 

The signature of the delegate takes an object as a parameter and returns void. My lambda matches this, yet it&#39;s not working. What am I missing?

Dispatcher.BeginInvoke: Cannot convert lambda to System.Delegate

For the following code:

    struct B
    {
        void g()
        {
            []() { B::f(); }();
        }
    
        static void f();
    };

g++ 4.6 gives the error:

&gt; test.cpp: In lambda function:  
&gt;  test.cpp:44:21: error: &#39;this&#39; was not captured for this lambda function

(Interestingly, g++ 4.5 compiles the code fine).

Is this a bug in g++ 4.6, or is it really necessary to capture the &#39;this&#39; parameter to be able to call a static member function? I don&#39;t see why it should be, I even qualified the call with `B::`.

lambdas require capturing &#39;this&#39; to call static member function?

I have the following code:

    Func&lt;string, bool&gt; comparer = delegate(string value) {
        return value != &quot;0&quot;;
    };

However, the following does not compile:

    var comparer = delegate(string value) {
        return value != &quot;0&quot;;
    };

Why can&#39;t the compiler figure out it is a `Func&lt;string, bool&gt;`? It takes one string parameter, and returns a boolean. Instead, it gives me the error:

&gt; Cannot assign anonymous method to an
&gt; implicitly-typed local variable.

I have one guess and that is *if the var version compiled*, it would lack consistency if I had the following:

    var comparer = delegate(string arg1, string arg2, string arg3, string arg4, string arg5) {
        return false;
    };

The above wouldn&#39;t make sense since Func&lt;&gt; allows only up to 4 arguments (in .NET 3.5, which is what I am using). Perhaps someone could clarify the problem. Thanks.


Why can&#39;t an anonymous method be assigned to var?

Does anyone know how to clear the immediate window using VBA?

While I can always clear it myself manually, I am curious if there is a way to do this programmatically.

Use VBA to Clear Immediate Window?

If I use `dynamic` in the immediate window of Visual Studio I get an error

&gt; Predefined type &#39;Microsoft.CSharp.RuntimeBinder.Binder&#39; is not defined or imported

How can I fix that?


Content Type	Original Author	Original Content on Stackoverflow
Question	indra	View Question on Stackoverflow
Solution 1 - C#	Holf	View Answer on Stackoverflow

Visual Studio Immediate Window - Lambda Expressions Aren't Allowed - Is there a Work-around or Alternative?

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