Use [this][1] overload and use 

    returnType.GetMethod(&quot;Parse&quot;, new [] {typeof(string)})


  [1]: http://msdn.microsoft.com/en-us/library/6hy0h0z1.aspx

What is the Wix &#39;**KeyPath**&#39; attribute? In particular, how does it apply to the following:

&lt;!-- language: xml --&gt;

    &lt;Component Id=&quot;ProgramMenuDir&quot; Guid=&quot;*&quot;&gt;
      &lt;RemoveFolder Id=&quot;ProgramMenuDir&quot; On=&quot;uninstall&quot; /&gt;
      &lt;RegistryValue Root=&quot;HKCU&quot; Key=&quot;Software\CompName\AppName&quot; 
                     Type=&quot;string&quot; Value=&quot;&quot; KeyPath=&quot;yes&quot; /&gt;
    &lt;/Component&gt;



What is the wix &#39;KeyPath&#39; attribute?

I have a form that has three submit buttons as follows:

    &lt;input type=&quot;submit&quot; name=&quot;COMMAND&quot; value=&quot;&amp;lsaquo; Prev&quot;&gt;
    &lt;input type=&quot;submit&quot; name=&quot;COMMAND&quot; value=&quot;Save&quot;&gt;
    &lt;input type=&quot;reset&quot;  name=&quot;NOTHING&quot; value=&quot;Reset&quot;&gt;
    &lt;input type=&quot;submit&quot; name=&quot;COMMAND&quot; value=&quot;Next &amp;rsaquo;&quot;&gt;
    &lt;input type=&quot;button&quot; name=&quot;NOTHING&quot; value=&quot;Skip &amp;rsaquo;&quot; onclick=&quot;location = &#39;yada-yada.asp&#39;;&quot;&gt;

The row of buttons is a mix of submit, reset and JavaScript buttons. The order of buttons is subject to change, but in any case the save button remains between prev and next buttons.

The problem here is that when a user hits &lt;kbd&gt;Enter&lt;/kbd&gt; to submit the form, the post variable &quot;COMMAND&quot; contains &quot;Prev&quot;; normal, as this is the first submit button on the form. I however want the &quot;Next&quot; button to be triggered when the user submits the form via the &lt;kbd&gt;Enter&lt;/kbd&gt; button. It is kind of like setting it as the default submit button, even though there are other buttons before it.


Multiple submit buttons on HTML form – designate one button as default

I am invoking a static method *Parse* on a type via reflection because I do not know the type of the object at compile-time (I do know, however, it has a *Parse* method, taking a string).

However, I am getting an ambiguous match exception, presumably because there are a lot of overloaded *Parse* methods each taking a single object (string, int, double etc.).

How can I be more specific in my method invocation to ensure I reach the correct method (*Parse(string s)*) and the exception is not thrown.

My code looks like this:

    Type returnType = p.PropertyType;
    object value = returnType.GetMethod(&quot;Parse&quot;).Invoke(null, new string[] { &quot;1&quot; });


Avoiding an ambiguous match exception

I am invoking a static method Parse on a type via reflection because I do not know the type of the object at compile-time (I do know, however, it has a Parse method, taking a string).
However, I am getting an ambiguous match exception, presumably because there are a lot of overloaded Parse methods each taking a single object (string, int, double etc.).
How can I be more specific in my method invocation to ensure I reach the correct method (Parse(string s)) and the exception is not thrown.
My code looks like this:
<pre><code class="hljs language-ini">Type returnType = p.PropertyType;
object value = returnType.GetMethod("Parse").Invoke(null, new string[] { "1" });
</code></pre>

That&#39;s kind of a general question (but I&#39;m using C#), what&#39;s the best way (best practice), do you return null or empty collection for a method that has a collection as a return type ?

Is it better to return null or empty collection?

I ran into this today and have no idea why the C# compiler isn&#39;t throwing an error.

    Int32 x = 1;
    if (x == null)
    {
    	Console.WriteLine(&quot;What the?&quot;);
    }

I&#39;m confused as to how x could ever possibly be null. Especially since this assignment definitely throws a compiler error:

    Int32 x = null;

Is it possible that x could become null, did Microsoft just decide to not put this check into the compiler, or was it missed completely?

Update: After messing with the code to write this article, suddenly the compiler came up with a warning that the expression would never be true. Now I&#39;m really lost. I put the object into a class and now the warning has gone away but left with the question, can a value type end up being null.

    public class Test
    {
    	public DateTime ADate = DateTime.Now;
    
    	public Test ()
    	{
    		Test test = new Test();
    		if (test.ADate == null)
    		{
    			Console.WriteLine(&quot;What the?&quot;);
    		}
    	}
    }

C# okay with comparing value types to null

I am extracting a `bool` value from a (non-generic, heterogeneous) collection.

The `as` operator may only be used with reference types, so it is not possible to do use `as` to try a safe-cast to `bool`:

    // This does not work: &quot;The as operator must be used with a reference type (&#39;bool&#39; is a value type)&quot;
    object rawValue = map.GetValue(key);
    bool value = rawValue as bool;

Is there something similar that can be done to safely cast an object to a value type without possibility of an `InvalidCastException` if, for whatever reason, the value is not a boolean?

How do I safely cast a System.Object to a `bool` in C#?

I have two questions:

1. I&#39;m wondering how I can display no link text when using `Html.ActionLink()` in an MVC view (actually, this is `Site.Master`). 

There is not an overloaded version that does not allow link text, and when I try passing in just a blank `string`, the compiler tells me it needs a non-empty string. 

How can I fix this?

2. I need to put `&lt;span&gt;` tags within the anchor tag, but it&#39;s not working with `Html.ActionLink();`. I&#39;d like to see the following output:

    &lt;li id=&quot;home_nav&quot;&gt;&lt;a href=&quot;homeurl&quot;&gt;&lt;span&gt;Span text&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;

How can I put tags inside of the anchor tag in ASP.NET MVC?

Putting HTML inside Html.ActionLink(), plus No Link Text?

today I was wondering if there is a better solution perform the following code sample.

    string keyword = &quot; abc, foo  ,     bar&quot;;
    string match = &quot;foo&quot;;
    string[] split= keyword.Split(new char[] { &#39;,&#39;, &#39;;&#39; }, StringSplitOptions.RemoveEmptyEntries);
    foreach(string s in split)
    {
      if(s.Trim() == match){// asjdklasd; break;}
    }

Is there a way to perform trim() without manually iterating through each item? I&#39;m looking for something like &#39;split by the following chars and automatically trim each result&#39;. 

Ah, immediatly before posting I found

    List&lt;string&gt; parts = line.Split(&#39;;&#39;).Select(p =&gt; p.Trim()).ToList();
 in https://stackoverflow.com/questions/1728303/how-can-i-split-and-trim-a-string-into-parts-all-on-one-line

Still I&#39;m curious: Might there be a better solution to this? (Or would the compiler probably convert them to the same code output as the Linq-Operation?)


Perform Trim() while using Split()

Can any one explain the use of Java reflection and introspection? When we need to use both?


Java introspection and reflection

This is kind of a silly question, but is it possible to get the name of the method that is currently being executed from within that method?

    Public Sub SomeMethod()
    
       Dim methodName as String = System.Reflection.[function to get the current method name here?]
    
    End Sub

Thanks



Get the name of the current method

If I have a class called `MyProgram`, is there a way of retrieving &quot;*MyProgram*&quot; as a string?

C# getting its own class name

I have a class and I want to find all of its *public fields* (not methods). How can I do this?

Get all variable names in a class

I&#39;m creating a [custom attribute][1] in C# and I want to do different things based on whether the attribute is applied to a method versus a property.  At first I was going to do `new StackTrace().GetFrame(1).GetMethod()` in my custom attribute constructor to see what method called the attribute constructor, but now I&#39;m unsure what that will give me.  What if the attribute was applied to a property?  Would `GetMethod()` return a `MethodBase` instance for that property?  Is there a different way of getting the member to which an attribute was applied in C#?

    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Property,
        AllowMultiple = true)]
    public class MyCustomAttribute : Attribute

__Update:__  okay, I might have been asking the wrong question.  From within a custom attribute class, how do I get the member (or the class containing the member) to which my custom attribute was applied?  [Aaronaught][2] suggested against walking up the stack to find the class member to which my attribute was applied, but how else would I get this information from within the constructor of my attribute?

  [1]: http://msdn.microsoft.com/en-us/library/sw480ze8(VS.80).aspx
  [2]: https://stackoverflow.com/questions/2168942/c-custom-attributes-how-to-get-the-member-type-to-which-an-attribute-was-appl/2169177#2169177

How do I get the member to which my custom attribute was applied?

I&#39;m learning about function overloading in C++ and came across this:

	void display(int a)
	{
		cout &lt;&lt; &quot;int&quot; &lt;&lt; endl;
	}
	
	void display(unsigned a)
	{
		cout &lt;&lt; &quot;unsigned&quot; &lt;&lt; endl;
	}
	
	int main()
	{
		int i = -2147483648;
		cout &lt;&lt; i &lt;&lt; endl; //will display -2147483648
		display(-2147483648);
	}

From what I understood, any value given in the `int` range (in my case `int` is 4 byte) will call `display(int)` and any value outside this range will be ambiguous (since the compiler cannot decide which function to call). It is valid for the complete range of `int` values except its min value i.e. `-2147483648` where compilation fails with the error

&gt; call of overloaded `display(long int)` is ambiguous

But taking the same value to an `int` and printing the value gives `2147483648`. I&#39;m literally confused with this behavior.

Why is this behavior observed only when the most negative number is passed? (The behavior is the same if a `short` is used with `-32768` - in fact, in any case where the negative number and positive number have the same binary representation)

Compiler used: g++ (GCC) 4.8.5

Content Type	Original Author	Original Content on Stackoverflow
Question	Ben Aston	View Question on Stackoverflow
Solution 1 - C#	Benjamin Podszun	View Answer on Stackoverflow

Avoiding an ambiguous match exception

C# Problem Overview

C# Solutions

Solution 1 - C#

Multiple submit buttons on HTML form – designate one button as default

What is the wix 'KeyPath' attribute?

Attributions