No, because there are no checked exceptions in C#

If you are trying to document exceptions that are thrown, use the standard xml documentation

    /// &lt;exception cref=&quot;InvalidOperationException&quot;&gt;Why it&#39;s thrown.&lt;/exception&gt;


No. There is no such construct in c#. But you can add the comment to your method like this 
`/// &lt;exception cref=&quot;Exception&quot;&gt;&lt;/exception&gt;`
and it will be visible in IntelliSense

Unfortunately there isn&#39;t, and it can be a pain.  The remedy is to be more careful with the exceptions that your code throws and how you handle errors.

I&#39;ve compiled a HelloWorld program, and I&#39;m using the command prompt to run it.  The .class file is named HelloWorld2.class

The file is located in C:\Users\Matt\workspace\HelloWorld2\bin
Here&#39;s what I&#39;m getting when I go to command prompt, and type &quot;Java HelloWorld2&quot; :

    C:\Users\Matt&gt;Java HelloWorld2
    Exception in thread &quot;main&quot; java.lang.NoClassDefFoundError: HelloWorld2
    Caused by: java.lang.ClassNotFoundException: HelloWorld2
            at java.net.URLClassLoader$1.run(Unknown Source)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.net.URLClassLoader.findClass(Unknown Source)
            at java.lang.ClassLoader.loadClass(Unknown Source)
            at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
            at java.lang.ClassLoader.loadClass(Unknown Source)
    Could not find the main class: HelloWorld2.  Program will exit.

I was expecting to see a HelloWorld printed out.  What am I doing wrong?  I have the JDK installed.


How do I run Java .class files?

Using Windows PowerShell, how do I change the command prompt?

For example, the default prompt says

    PS C:\Documents and Settings\govendes\My Documents&gt;

I want to customize that string.


Windows PowerShell: changing the command prompt

&gt; **Possible Duplicate:**  
&gt; [how to use Java-style throws keyword in C#?](https://stackoverflow.com/questions/3465465/how-to-use-java-style-throws-keyword-in-c)  

&lt;!-- End of automatically inserted text --&gt;

i have a function where an exception occurs
say for example

    private void functionName() throws Exception
    {
       // some code that might throw an exception
    }

thanks!

Is there a throws keyword in C# like in Java?

> Possible Duplicate: 
> <a href="https://stackoverflow.com/questions/3465465/how-to-use-java-style-throws-keyword-in-c" target="_blank" rel="noopener noreferrer">how to use Java-style throws keyword in C#?</a>

i have a function where an exception occurs
say for example
<pre><code class="hljs language-csharp">private void functionName() throws Exception
{
 // some code that might throw an exception
}
</code></pre>
thanks!

Can someone provide good examples of calling a JavaScript function From CodeBehind and Vice-versa?



Calling JavaScript Function From CodeBehind

I was trying to do some convention tests today, and getting all the types in an assembly (by calling `Assembly.GetTypes()`), when I stumbled into something:

    System.RuntimeType:[First.Namespace.FirstClass]

Whenever I try to compare that type with `typeof(FirstClass)`, they&#39;re not equal. So, when I try to find all the types that contain `FirstClass` as a generic parameter, I&#39;m not finding any.

What&#39;s the difference between `System.RuntimeType` and `System.Type`?

Is there any way to solve my problem?

What&#39;s the difference between System.Type and System.RuntimeType in C#?

I am using EPPlus to generate an XLSX file in C#. As soon as I instantiate the ExcelPackage with a memory stream - I get the error:

&gt;&quot;A disk error occurred during a write operation. (Exception from HRESULT: 0x8003001D (STG_E_WRITEFAULT))&quot;

Code is:

    MemoryStream stream = new MemoryStream();

    using (ExcelPackage package = new ExcelPackage(stream))
    {
        ...
    }

Has anyone else seen this?

Using EPPlus with a MemoryStream

When I want to do something with a list I first check it if is not `null` or contains no elements (not to blow a `foreach`) and I usually use `list.Any()` but what is the best option - to use `list.Count &gt; 0` , or to use `list.Any()`?

List&lt;T&gt; Any or Count?

**WARNING: THIS CODE SUCKS, SEE ANTHONY&#39;S COMMENTS**

Which is faster?

1.

      public bool IsValueType&lt;T&gt;(T obj){
           return obj is ValueType;
      }

2.

      public bool IsValueType&lt;T&gt;(T obj){
           return obj == null ? false : obj.GetType().IsValueType;
      } 

3.

      public bool IsValueType&lt;T&gt;(T obj){
           return default(T) != null;
      }

4.Something else

Most efficient way to check if an object is a value type

What is the difference between a Theory and a Parameterized test? 

I&#39;m not interested in implementation differences when creating the test classes, just when you would choose one over the other.

Difference between JUnit Theories and Parameterized Tests

I have a String with a &quot;&#241;&quot; character and I have some problems with it. I need to encode this String to UTF-8 encoding. I have tried it by this way, but it doesn&#39;t work:

    byte ptext[] = myString.getBytes();
    String value = new String(ptext, &quot;UTF-8&quot;);

How do I encode that string to utf-8?

Encode String to UTF-8

I am building a project in Java. 

I have this error:

&lt;!-- language: lang-none --&gt;

    Unable to locate tools.jar. Expected to find it in C:\Program Files\Java\jre6\lib\tools.jar

I have installed a JDK and the folder: `C:\Program Files\Java\jre6\lib` is in my system but the file `tools.jar` is not there.


Unable to locate tools.jar

I&#39;ve seen several discussions on the net about how great it would be to have an XML schema or DTD for logback.xml file to have at least the very basic validation and auto-completion in IDEs like IDEA or Eclipse, but I never saw any solution.

Did you?

XML schema or DTD for logback.xml?

Is there a way to determine if an object is an instance of a generic type?

    public &lt;T&gt; test(Object obj) {
        if (obj instanceof T) {
            ...
        }
    }

That clearly doesn&#39;t work. Is there an alternative? Like I want to use Java reflection to instantiate a class and then check to make sure it is of type generic `T`.


Test if object is instanceof a parameter type

Conventional wisdom says you can only throw objects that extend `Throwable` in Java, but is it possible to disable the bytecode verifier and get Java to compile and run code that throws arbitrary objects - or even primitives?

I looked up the JVM&#39;s [`athrow`][1] and it will pop the first objref on the operand stack; but would it check if said reference points to a `Throwable` at run time?


  [1]: http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-6.html#jvms-6.5.athrow

What can you throw in Java?

I try to add objects to a `List&lt;String&gt;` instance but it throws an `UnsupportedOperationException`.
Does anyone know why?

My Java code:
		
	String[] membersArray = request.getParameterValues(&#39;members&#39;);
	List&lt;String&gt; membersList = Arrays.asList(membersArray);
	
	for (String member : membersList) {
		Person person = Dao.findByName(member);
		List&lt;String&gt; seeAlso;
		seeAlso = person.getSeeAlso();
		if (!seeAlso.contains(groupDn)){
			seeAlso.add(groupDn);
			person.setSeeAlso(seeAlso);
		}
	}
		

The error message:

&lt;pre&gt;
java.lang.UnsupportedOperationException
    java.util.AbstractList.add(Unknown Source)
    java.util.AbstractList.add(Unknown Source)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
&lt;/pre&gt;


Java List.add() UnsupportedOperationException

I have some code that needs to rescue multiple types of exceptions in ruby:

    begin
      a = rand
      if a &gt; 0.5
        raise FooException
      else
        raise BarException
      end
    rescue FooException, BarException
      puts &quot;rescued!&quot;
    end

What I&#39;d like to do is somehow store the list of exception types that I want to rescue somewhere and pass those types to the rescue clause:

    EXCEPTIONS = [FooException, BarException]

and then:

    rescue EXCEPTIONS

Is this even possible, and is it possible without some really hack-y calls to `eval`? I&#39;m not hopeful given that I&#39;m seeing `TypeError: class or module required for rescue clause` when I attempt the above. 

Passing multiple error classes to ruby&#39;s rescue clause in a DRY fashion

&gt; **Possible Duplicate:**  
&gt; [Differences betweeen Exception and Error](https://stackoverflow.com/questions/912334/differences-betweeen-exception-and-error)  

&lt;!-- End of automatically inserted text --&gt;

How can I differentiate between Errors and Exceptions in Java?

What is difference between Errors and Exceptions?

Okay, its a very lame question for many but I hope I will have overwhelming response :)

When I throw an Exception in PHP I can add a code to the message.&lt;br&gt;
I catch an exception and handle it according to its type (Like `InvalidArgumentException` or `OutOfBoundException`). I log the &lt;strong&gt;message&lt;/strong&gt; or display it or do whatever is suitable.&lt;br&gt; 
I can add also append a previous exception to trace a path to the origin of the error.&lt;br&gt;

BUT one thing I have never used or never thought of: how useful is &lt;strong&gt;code&lt;/strong&gt;?&lt;br&gt;

For example: &lt;br&gt;

    throw new Exception(&quot;db Error&quot;, $code, $previousException);


What do I do with `$code`?

What do we need the PHP-exception code for? Any use case scenario?

I want to write a common error handler which will catch custom errors thrown on purpose at any instance of the code.

When I did `throw new Error(&#39;sample&#39;)` like in the following code

    try {
        throw new Error({&#39;hehe&#39;:&#39;haha&#39;});
        // throw new Error(&#39;hehe&#39;);
    } catch(e) {
    	alert(e);
    	console.log(e);
    }

Log shows in Firefox as `Error: [object Object]` and I couldn’t parse the object.

For the second `throw` the log shows as: `Error: hehe`

Whereas when I did

    try {
        throw ({&#39;hehe&#39;:&#39;haha&#39;});
    } catch(e) {
    	alert(e);
    	console.log(e);
    }

the console showed as: `Object { hehe=&quot;haha&quot;}` in which I was able to access the error properties.

**What is the difference?**

Is the difference as seen in the code? Like string will be just passed as string and object as objects but the syntax will be different?

I haven’t explored throwing error object… I had done only throwing strings.

Is there any other way than the above two mentioned methods?

What is the difference between `throw new Error` and `throw someObject`?

[PEP 342 (Coroutines via Enhanced Generators)][1] added a `throw()` method to generator objects, which allows the caller to raise an exception *inside* the generator (as if it was thrown by the `yield` expression).

I am wondering what the use cases for this feature are.


  [1]: http://www.python.org/dev/peps/pep-0342/

What is generator.throw() good for?

Is there any difference between `throw()` and `noexcept` other than being checked at runtime and compile time, respectively?

[This Wikipedia C++11 article](http://en.wikipedia.org/wiki/C%2B%2B11#Features_removed_or_deprecated) suggests that the C++03 throw specifiers are deprecated.  
Why so, is `noexcept` capable enough to cover all that at compile time ?

[Note: I checked [this question](https://stackoverflow.com/questions/88573/should-i-use-an-exception-specifier-in-c) and [this article](http://www.gotw.ca/publications/mill22.htm), but couldn&#39;t determine the solid reason for deprecation.]

Difference between C++03 throw() specifier C++11 noexcept

I have been coding in Java for a while now. But sometimes, I don&#39;t understand when I should throw the exception and when should I catch the exception. I am working on a project in which there are lot of methods. The hierarchy is something like this-

    Method A will call Method B and Method B will call some Method C and Method C will call Method D and Method E.
	
So currently what I am doing is- I am throwing exceptions in all the methods and catching it in Method A and then logging as an error.

But I am not sure whether this will be the right way to do it? Or should I start catching exceptions in all the Methods. So that is why this confusion started in my- When should I catch the Exception vs When should I throw the exceptions. I know it&#39;s a silly question but somehow I am struggling to understand this major concept.

Can someone give me a detailed example of `When to catch the Exception vs When to throw the Exceptions` so that my concepts gets cleared on this? And in my case, should I keep on throwing the exception and then catch it in the main calling Method A?


When to catch the Exception vs When to throw the Exceptions?

A method I am calling in [run()][1] in a class that implements [Runnable][2]) is designed to be throwing an exception.

But the Java compiler won&#39;t let me do that and suggests that I surround it with try/catch.

The problem is that by surrounding it with a try/catch I make *that particular* [run()][3] useless. I *do* want to throw that exception.

If I specify `throws` for [run()][4] itself, the compiler complains that `Exception is not compatible with throws clause in Runnable.run()`.

Ordinarily I&#39;m totally fine with not letting  [run()][3] throw an exception. But I have unique situation in which I must have that functionality.

How to I work around this limitation?


  [1]: http://developer.android.com/reference/java/lang/Runnable.html#run%28%29
  [2]: http://developer.android.com/reference/java/lang/Runnable.html
  [3]: http://developer.android.com/reference/java/lang/Runnable.html#run%28%29
  [4]: http://developer.android.com/reference/java/lang/Runnable.html#run%28%29

Is there a way to make Runnable&#39;s run() throw an exception?

    class throwseg1
    {
        void show() throws Exception
        {
            throw new Exception(&quot;my.own.Exception&quot;);
        }

        void show2() throws Exception  // Why throws is necessary here ?
        {
            show();
        }

        void show3() throws Exception  // Why throws is necessary here ?
        {
            show2();
        }
    
        public static void main(String s[]) throws Exception  // Why throws is necessary here ?
        {
            throwseg1 o1 = new throwseg1();
            o1.show3();
        }
    }

Why compiler reports that methods `show2()`, `show3()`, and `main()` have 

&gt; unreported exception Exception that must be caught or declared to be thrown

when I remove `throws Exception` from these methods? 

Why is &quot;throws Exception&quot; necessary when calling a function?

After searching for some references to figure it out, -unfortunately- I could not find useful -and simple- description about understanding the differences between `throws` and `rethrows`. It is kind of confusing when try to understand how we should use them.

I would mention that I am kind of familiar with the -default- `throws` with its simplest form for propagating an error, as follows:


    enum CustomError: Error {
        case potato
        case tomato
    }
    
    func throwCustomError(_ string: String) throws {
        if string.lowercased().trimmingCharacters(in: .whitespaces) == &quot;potato&quot; {
            throw CustomError.potato
        }
        
        if string.lowercased().trimmingCharacters(in: .whitespaces) == &quot;tomato&quot; {
            throw CustomError.tomato
        }
    }
    
    do {
        try throwCustomError(&quot;potato&quot;)
    } catch let error as CustomError {
        switch error {
        case .potato:
            print(&quot;potatos catched&quot;) // potatos catched
        case .tomato:
            print(&quot;tomato catched&quot;)
        }
    }

So far so good, but the problem arises when:

    func throwCustomError(function:(String) throws -&gt; ()) throws {
        try function(&quot;throws string&quot;)
    }
    
    func rethrowCustomError(function:(String) throws -&gt; ()) rethrows {
        try function(&quot;rethrows string&quot;)
    }
    
    rethrowCustomError { string in
        print(string) // rethrows string
    }
    
    try throwCustomError { string in
        print(string) // throws string
    }

what I know so far is when calling a function that `throws` it has to be handled by a `try`, unlike the `rethrows`. So what?! What is logic that we should follow when deciding to use `throws` or `rethrows`?

Content Type	Original Author	Original Content on Stackoverflow
Question	user677607	View Question on Stackoverflow
Solution 1 - C#	Dilum Ranatunga	View Answer on Stackoverflow
Solution 2 - C#	fedotoves	View Answer on Stackoverflow
Solution 3 - C#	Alan Delimon	View Answer on Stackoverflow

Is there a throws keyword in C# like in Java?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Windows PowerShell: changing the command prompt

How do I run Java .class files?

Attributions