The `ThreadStaticAttribute` is only designed to be used on static variables, as [the documentation points out](https://docs.microsoft.com/en-us/dotnet/api/system.threadstaticattribute). If you use it on an instance variable, I suspect it will do precisely nothing.

In the first case it would probably be ignored, whereas in the second case you are correct, one instance per thread.

In Microsoft Docs, [it says][1]:

&gt; Indicates that the value of a **static** field is unique for each thread. 

So I guess your first case is incorrect. The attribute will probably be ignored.

[1]: https://docs.microsoft.com/en-us/dotnet/api/system.threadstaticattribute

What GUI library does Google Chrome use? 



Which GUI library does Google Chrome use?

I can&#39;t believe I can&#39;t find this information easily accessible, so:

1) Which characters cannot be incorporated in an XML attribute without entity-encoding them?

Obviously, you need to encode quotes. What about `&lt;` and `&gt;`? What else?

2) Where exactly is the official list?

Which characters are Invalid (unless encoded) in an XML attribute?

I have some code where I use a thread static object in C#.

    [ThreadStatic]
    private DataContext connection 

I was wondering, in this case, what if any change would I get if I put the static modifier on the thread static context?

    [ThreadStatic]
    private static DataContext connection 

With the first would there be one copy of the context per instance per thread, with the other only one copy per thread?

ThreadStatic Modified with Static C#

I have some code where I use a thread static object in C#.
<pre><code class="hljs language-csharp">[ThreadStatic]
private DataContext connection 
</code></pre>
I was wondering, in this case, what if any change would I get if I put the static modifier on the thread static context?
<pre><code class="hljs language-csharp">[ThreadStatic]
private static DataContext connection 
</code></pre>
With the first would there be one copy of the context per instance per thread, with the other only one copy per thread?

Is there any way to bulk-delete a bunch of objects matching a given query in LINQ or LINQ-to-Entities?  The only references that I can find are outdated, and it seems silly to iterate over and manually delete all objects I wish to remove.

Bulk-deleting in LINQ to Entities

I am in the design phase of writing a new Windows service application that accepts TCP/IP connections for long running connections (i.e., this is not like HTTP where there are many short connections, but rather a client connects and stays connected for hours or days or even weeks).

I&#39;m looking for ideas for the best way to design the network architecture.  I&#39;m going to need to start at least one thread for the service.  I am considering using the Asynch API (BeginRecieve, etc.) since I don&#39;t know how many clients I will have connected at any given time (possibly hundreds).  I definitely do not want to start a thread for each connection.

Data will primarily flow out to the clients from my server, but there will be some commands sent from the clients on occasion.  This is primarily a monitoring application in which my server sends status data periodically to the clients.

What is the best way to make this as scalable as possible? Basic workflow?

To be clear, I&#39;m looking for .NET-based solutions (C# if possible, but any .NET language will work).

I would need a working example of a solution, either as a pointer to something I could download or a short example in-line.  And it must be .NET and Windows based (any .NET language is acceptable).




How to write a scalable TCP/IP based server

While it is trivial to store a checkbox&#39;s checked state in a variable using the checkbox&#39;s Click event, how would I do it via databinding?  All the examples I have found have the UI updated from some datasource, or bind one control to another; I want to update a member variable when the checkbox is clicked.

TIA for any pointers...

WPF checkbox binding

Can I make XmlSerializer ignore the namespace (xmlns attribute) on deserialization so that it doesn&#39;t matter if the attribute is added or not or even if the attribute is bogus?  I know that the source will always be trusted so I don&#39;t care about the xmlns attribute.

Can I make XmlSerializer ignore the namespace on deserialization?

I got the above error in my app. Here is the original code

    public string GetCustomerNumber(Guid id)
    {
         string accountNumber = 
              (string)DBSqlHelperFactory.ExecuteScalar(connectionStringSplendidmyApp, 
                              CommandType.StoredProcedure, 
                              &quot;GetCustomerNumber&quot;, 
                              new SqlParameter(&quot;@id&quot;, id));
         return accountNumber.ToString();
     }


I replaced with


    public string GetCustomerNumber(Guid id)
    {
       object accountNumber =  
              (object)DBSqlHelperFactory.ExecuteScalar(connectionStringSplendidCRM, 
                                    CommandType.StoredProcedure, 
                                    &quot;spx_GetCustomerNumber&quot;, 
                                    new SqlParameter(&quot;@id&quot;, id));
        if (accountNumber is System.DBNull)
        {
           return string.Empty;
        }
        else
        {
           return accountNumber.ToString();
        }
    }

Is there a better way around this?


Unable to cast object of type &#39;System.DBNull&#39; to type &#39;System.String`

I&#39;m using a static code block to initialize some controllers in a registry I have. My question is therefore, can I guarantee that this static code block will only absolutely be called once when the class is first loaded? I understand I cannot guarantee when this code block will be called, I&#39;m guessing its when the Classloader first loads it. I realize I could synchronize on the class in the static code block, but my guess is this is actually what happens anyway? 

Simple code example would be;

    class FooRegistry {

        static {
            //this code must only ever be called once 
            addController(new FooControllerImpl());
        }

        private static void addController(IFooController controller) { 
            // ...
        }
    }

or should I do this;

    class FooRegistry {

        static {
            synchronized(FooRegistry.class) {
                addController(new FooControllerImpl());
            }
        }

        private static void addController(IFooController controller) {
            // ...
        }
    }




Are Java static initializers thread safe?

Referring to the [first answer][1] about python&#39;s bound and unbound methods here, I have a question:

    class Test:
        def method_one(self):
            print &quot;Called method_one&quot;
        @staticmethod
        def method_two():
            print &quot;Called method_two&quot;
        @staticmethod
        def method_three():
            Test.method_two()
    class T2(Test):
        @staticmethod
        def method_two():
            print &quot;T2&quot;
    a_test = Test()
    a_test.method_one()
    a_test.method_two()
    a_test.method_three()
    b_test = T2()
    b_test.method_three()

produces output:

    Called method_one
    Called method_two
    Called method_two
    Called method_two

Is there a way to override a static method in python?

I expected `b_test.method_three()` to print &quot;T2&quot;, but it doesn&#39;t (prints &quot;Called method_two&quot; instead).


  [1]: https://stackoverflow.com/questions/114214/class-method-differences-in-python-bound-unbound-and-static/114267#114267

Overriding a static method in python

I have a question regarding static function in php.

let&#39;s assume that I have a class

    class test {
        public function sayHi() {
            echo &#39;hi&#39;;
        }
    }

if I do `test::sayHi();` it works without a problem.

    class test {
        public static function sayHi() {
            echo &#39;hi&#39;;
        }
    }

`test::sayHi();` works as well.

What are the differences between first class and second class?

What is special about a static function?

php static function

How can one get the name of the class from a static method in that class. For example

    public class MyClass {
        public static String getClassName() {
            String name = ????; // what goes here so the string &quot;MyClass&quot; is returned
            return name;
        }
    }

To put it in context, I actually want to return the class name as part of a message in an exception.

Getting the class name from a static method in Java

Why can&#39;t we have static method in a non-static inner class?

    public class Foo {
        class Bar {
            static void method() {} // Compiler error
        }
    }

If I make the inner class static it works. Why?

    public class Foo {
        static class Bar { // now static
            static void method() {}
        }
    }

In Java 16+, both of these are valid.

Why can&#39;t we have static method in a (non-static) inner class (pre-Java 16)?

How is ThreadLocal implemented? Is it implemented in Java (using some concurrent map from ThreadID to object), or does it use some JVM hook to do it more efficiently?

Content Type	Original Author	Original Content on Stackoverflow
Question	Anthony D	View Question on Stackoverflow
Solution 1 - C#	Noldorin	View Answer on Stackoverflow
Solution 2 - C#	Otávio Décio	View Answer on Stackoverflow
Solution 3 - C#	Thomas Levesque	View Answer on Stackoverflow

ThreadStatic Modified with Static C#

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Which characters are Invalid (unless encoded) in an XML attribute?

Which GUI library does Google Chrome use?

Attributions