    t.GetElementType() 

[Reference][1].


  [1]: http://msdn.microsoft.com/en-us/library/system.type.getelementtype(VS.71).aspx

I just started using ELMAH and am a fan. My team supports a large number of web applications and I&#39;m particularly excited that ELMAH lets us save exceptions from each application to the same MS SQL database table.

We also support a few console, DLL and desktop applications.  Is it possible to use the ELMAH DLL to log exceptions in these apps to that same location?

Using ELMAH in a console application

So I am a new programmer and I just installed XCode on my Macbook to get the GCC. I think Xcode is the only way for getting GCC on OSX. Now when I run my Hello World application, in C++, g++ comes up saying it is version 4.0.1 but when I look for commands starting with g I also see g++-4.2. Is there any way of making 4.2 default rather than 4.0.1, and also is there a way to updating gcc to the latest version 4.4.0?

EDIT: Ok, so I installed macports and installed gcc4.4 and it shows up on terminal as gcc-mp-4.4 and how do I make it default with gcc_select, like what are the commands and stuff. Thanks.

Update GCC on OSX

I have an instance of System.Type, for which &quot;IsArray&quot; returns true.

How can I determine the &quot;nested type&quot; of the array type?

i.e. 

    Type GetArrayType(Type t)
    {
        if(t.IsArray)
        {
            //  What to put here?
        }
        throw new Exception(&quot;Type is not an array&quot;);
    }
    Assert.That(GetArrayType(typeof(string[])), Iz.EqualTo(typeof(string));
    Assert.That(GetArrayType(typeof(Foo[])), Iz.EqualTo(typeof(Foo));




How do I use reflection to determine the nested type (element type) of an array?

I have an instance of System.Type, for which "IsArray" returns true.
How can I determine the "nested type" of the array type?
i.e.
<pre><code class="hljs language-csharp">Type GetArrayType(Type t)
{
 if(t.IsArray)
 {
 // What to put here?
 }
 throw new Exception("Type is not an array");
}
Assert.That(GetArrayType(typeof(string[])), Iz.EqualTo(typeof(string));
Assert.That(GetArrayType(typeof(Foo[])), Iz.EqualTo(typeof(Foo));
</code></pre>

Does C# allow hashtables to be populated in one-line expressions? I am thinking of something equivalent to the below Python:

    mydict = {&quot;a&quot;: 23, &quot;b&quot;: 45, &quot;c&quot;: 67, &quot;d&quot;: 89}

In other words, is there an alternative to setting each key-value pair in a separate expression?

Most concise way to initialize a C# hashtable

How would you normalize all new-line sequences in a string to one type?

I&#39;m looking to make them all CRLF for the purpose of email (MIME documents).  Ideally this would be wrapped in a static method, executing very quickly, and not using regular expressions (since the variances of line breaks, carriage returns, etc. are limited).  Perhaps there&#39;s even a BCL method I&#39;ve overlooked?

ASSUMPTION: After giving this a bit more thought, I think it&#39;s a safe assumption to say that CR&#39;s are either stand-alone or part of the CRLF sequence.  That is, if you see CRLF then you know all CR&#39;s can be removed.  Otherwise it&#39;s difficult to tell how many lines should come out of something like &quot;\r\n\n\r&quot;.

What is a quick way to force CRLF in C# / .NET?

I have two DateTime vars, beginTime and endTime. I have gotten the difference of them by doing the following:

    TimeSpan dateDifference = endTime.Subtract(beginTime);

How can I now return a string of this in hh hrs, mm mins, ss secs format using C#.

If the difference was 00:06:32.4458750

It should return this 00 hrs, 06 mins, 32 secs

  [1]: https://stackoverflow.com/questions/840120/timespan-formatting

How do I convert a TimeSpan to a formatted string?

I have this code;

    using System;

    namespace Rapido
    {
        class Constants
        {
            public static const string FrameworkName = &quot;Rapido Framework&quot;;
        }  
    }

Visual Studio tells me: `The constant &#39;Rapido.Constants.FrameworkName&#39; cannot be marked static`

How can I make this constant available from other classes without having to create a new instance of it? (ie. directly accessing it via `Rapido.Constants.FrameworkName`)

Static Constants in C#

As a non-.NET programmer I&#39;m looking for the .NET equivalent of the old Visual Basic function `left(string, length)`. It was lazy in that it worked for any length string. As expected, `left(&quot;foobar&quot;, 3) = &quot;foo&quot;` while, most helpfully, `left(&quot;f&quot;, 3) = &quot;f&quot;`.

In .NET `string.Substring(index, length)` throws exceptions for everything out of range. In Java I always had the Apache-Commons lang.StringUtils handy. In Google I don&#39;t get very far searching for string functions.

&lt;hr/&gt;

**@Noldorin** - Wow, thank you for your VB.NET extensions! My first encounter, although it took me several seconds to do the same in C#:

    public static class Utils
    {
        public static string Left(this string str, int length)
        {
            return str.Substring(0, Math.Min(length, str.Length));
        }
    }

Note the static class and method as well as the `this` keyword. Yes, they are as simple to invoke as `&quot;foobar&quot;.Left(3)`. See also [C# extensions on MSDN][1].

  [1]: http://msdn.microsoft.com/en-us/library/bb383977.aspx


.NET equivalent of the old vb left(string, length) function

I&#39;ve read that it&#39;s unwise to use ToUpper and ToLower to perform case-insensitive string comparisons, but I see no alternative when it comes to LINQ-to-SQL. The ignoreCase and CompareOptions arguments of String.Compare are ignored by LINQ-to-SQL (if you&#39;re using a case-sensitive database, you get a case-sensitive comparison even if you ask for a case-insensitive comparison).  Is ToLower or ToUpper the best option here?  Is one better than the other?  I thought I read somewhere that ToUpper was better, but I don&#39;t know if that applies here.  (I&#39;m doing a lot of code reviews and everyone is using ToLower.)

    Dim s = From row In context.Table Where String.Compare(row.Name, &quot;test&quot;, StringComparison.InvariantCultureIgnoreCase) = 0

This translates to an SQL query that simply compares row.Name with &quot;test&quot; and will not return &quot;Test&quot; and &quot;TEST&quot; on a case-sensitive database.

Case insensitive string compare in LINQ-to-SQL

I&#39;ve got a WPF window with `SizeToContent=&quot;Height&quot;`. This window contains an `&lt;Expander /&gt;` that displays a list of recent activity. What I&#39;d like is when the expander is expanded the window grows in size proportionally. When hidden the window again resizes proportionally. If the window is resized the expander and it&#39;s contained list view should grow to use the new space. (don&#39;t mind the colors there there to help me figure this out):

**Normal View**

![alt text][1]

**Collapsed**

![alt text][2]

**Resized to new space**

![alt text][3]


So far this works great. The problem comes when the `&lt;Expander /&gt;` is collapsed after the window is resized. Rather than the window collapsing again, the list view is simply hidden:

**Collapsed after Resize**

![alt text][4]

My intuition tells me that the `Height` of the window is being set when the window resizes and thus overrides the `SizeToContent` property. So, how can I get the window to keep it&#39;s size to content behavior after it&#39;s been resized?

Current XAML:

    &lt;Window x:Class=&quot;DeployLX.Licensing.Nlm.Admin.v3.DashboardWindow&quot;
        xmlns=&quot;http://schemas.microsoft.com/winfx/2006/xaml/presentation&quot;
        xmlns:x=&quot;http://schemas.microsoft.com/winfx/2006/xaml&quot;
        Title=&quot;Dashboard&quot; Width=&quot;504&quot; SizeToContent=&quot;Height&quot; Height=&quot;275&quot;&gt;
    
      &lt;DockPanel&gt;
        &lt;Menu DockPanel.Dock=&quot;Top&quot;&gt;
          &lt;MenuItem Header=&quot;_File&quot;&gt;
            &lt;MenuItem Header=&quot;E_xit&quot; Command=&quot;{Binding Path=CloseCmd}&quot; /&gt;
          &lt;/MenuItem&gt;
        &lt;/Menu&gt;
        &lt;Grid DockPanel.Dock=&quot;Top&quot; Margin=&quot;8&quot; ShowGridLines=&quot;True&quot;&gt;
          &lt;Grid.RowDefinitions&gt;
            &lt;RowDefinition /&gt;
            &lt;RowDefinition /&gt;
          &lt;/Grid.RowDefinitions&gt;
          &lt;Grid.ColumnDefinitions&gt;
            &lt;ColumnDefinition /&gt;
            &lt;ColumnDefinition /&gt;
          &lt;/Grid.ColumnDefinitions&gt;
          
          &lt;Grid Grid.RowSpan=&quot;2&quot; Grid.Row=&quot;0&quot; Grid.Column=&quot;0&quot; Margin=&quot;0,0,8,0&quot;&gt;
            &lt;Rectangle Fill=&quot;Red&quot; /&gt;
            &lt;TextBlock&gt;ActiveCount&lt;/TextBlock&gt;        
          &lt;/Grid&gt;
          
          &lt;Grid Grid.Row=&quot;0&quot; Grid.Column=&quot;1&quot; Margin=&quot;0,0,0,4&quot;&gt;
            &lt;Rectangle Fill=&quot;Green&quot; /&gt;
            &lt;TextBlock&gt;Authorization&lt;/TextBlock&gt;
          &lt;/Grid&gt;
          &lt;Grid Grid.Row=&quot;1&quot; Grid.Column=&quot;1&quot; Margin=&quot;0,4,0,0&quot;&gt;
            &lt;Rectangle Fill=&quot;Blue&quot; /&gt;
            &lt;TextBlock&gt;Authorization&lt;/TextBlock&gt;
          &lt;/Grid&gt;      
        &lt;/Grid&gt;
        &lt;Expander Header=&quot;Recent Activity&quot; Margin=&quot;8&quot; IsExpanded=&quot;True&quot;&gt;
          &lt;ListView IsSynchronizedWithCurrentItem=&quot;True&quot; MinHeight=&quot;100&quot;&gt;
            &lt;ListView.View&gt;
              &lt;GridView&gt;
                &lt;GridViewColumn Header=&quot;Status&quot;/&gt;
              &lt;/GridView&gt;
            &lt;/ListView.View&gt;
          &lt;/ListView&gt;
        &lt;/Expander&gt;
      &lt;/DockPanel&gt;
    &lt;/Window&gt;

**UPDATE:** I&#39;ve tried listening to the Collapsed event of the expander and resetting the Windows `SizeToContent` property. This almost works. It will cause it to collapse the window again but when expanded again it goes back to the original 100 pixel height. While it&#39;s feasible to store and capture this info it smells hacky and prone to errors.

  [1]: http://www.deploylx.com/so/wpfexpander/Open.png &quot;Normal view&quot;
  [2]: http://www.deploylx.com/so/wpfexpander/Closed.png &quot;Closed&quot;
  [3]: http://www.deploylx.com/so/wpfexpander/Expanded.png &quot;Expanded to use new space&quot;
  [4]: http://www.deploylx.com/so/wpfexpander/Collapsed.png &quot;Collapsed after Resize&quot;

How do you keep the WPF window sized to content with an Expander after resize

I have a class that uses XML and reflection to return `Object`s to another class.

Normally these objects are sub fields of an external object, but occasionally it&#39;s something I want to generate on the fly. I&#39;ve tried something like this but to no avail. I believe that&#39;s because Java won&#39;t allow you to access `private` methods for reflection.

    Element node = outerNode.item(0);
    String methodName = node.getAttribute(&quot;method&quot;);
    String objectName = node.getAttribute(&quot;object&quot;);

    if (&quot;SomeObject&quot;.equals(objectName))
        object = someObject;
    else
        object = this;

    method = object.getClass().getMethod(methodName, (Class[]) null);

If the method provided is `private`, it fails with a `NoSuchMethodException`. I could solve it by making the method `public`, or making another class to derive it from.

Long story short, I was just wondering if there was a way to access a `private` method via reflection.

Any way to Invoke a private method?

is there a way to retrieve type `T` from `IEnumerable&lt;T&gt;` through reflection?

e.g.

i have a variable `IEnumerable&lt;Child&gt;` info; i want to retrieve Child&#39;s type through reflection



getting type T from IEnumerable&lt;T&gt;

I am wondering, since a lot of things can be done using reflection, can I change a private readonly field after the constructor completed its execution?  
(note: just curiosity)

    public class Foo
    {
     private readonly int bar;
     
     public Foo(int num)
     {
      bar = num;
     }
     
     public int GetBar()
     {
      return bar;
     }
    }
    
    Foo foo = new Foo(123);
    Console.WriteLine(foo.GetBar()); // display 123
    // reflection code here...
    Console.WriteLine(foo.GetBar()); // display 456



Can I change a private readonly field in C# using reflection?

How can I get all classes within a namespace in C#?

How can I get all classes within a namespace?

I want to check if an object `o` is an instance of the class `C` or of a subclass of `C`.

For instance, if `p` is of class `Point` I want `x.instanceOf(Point.class)` to be `true` and also `x.instanceOf(Object.class)` to be `true`.

I want it to work also for boxed primitive types. For instance, if `x` is an `Integer` then `x.instanceOf(Integer.class)` should be `true`.

Is there such a thing? If not, how can I implement such a method?

Content Type	Original Author	Original Content on Stackoverflow
Question	Paul Hollingsworth	View Question on Stackoverflow
Solution 1 - C#	swilliams	View Answer on Stackoverflow

How do I use reflection to determine the nested type (element type) of an array?

C# Problem Overview

C# Solutions

Solution 1 - C#

Update GCC on OSX

Using ELMAH in a console application

Attributions