C#使用CallContext缓存线程数据

public static class DbContextHelper
{
    private static DbContext context = null;
    private const string SessionKey_DbContext = "Entities";
    public static DbContext GetDbContext()
    {
        if (CallContext.GetData(SessionKey_DbContext) == null)
        {
            CallContext.SetData(SessionKey_DbContext, new Entities());
        }
        return CallContext.GetData(SessionKey_DbContext) as Entities;
    }
}

void Main()
{
    MyAppContext.Current.FirstName = "a";
    Console.Write(MyAppContext.Current.FirstName);
}

public class MyAppContext
{
    const string contexTKEy = "MyAppContext:ContextKey";
    public string FirstName { get; set; }
    public static MyAppContext Current
    {
        get
        {
            if (CallContext.GetData(contextKey) == null)
            {
                CallContext.SetData(contextKey, new MyAppContext());
            }
            return CallContext.GetData(SessionKey_DbContext) as MyAppContext;
        }
    }
}

for (var i = 0; i < 10; i++)
{
    Thread.Sleep(10);

    Task.Run(() =>
    {
        var slot = Thread.GetNamedDataSlot("test");
        if (slot == null)
        {
            Thread.AllocateNamedDataSlot("test");
        }

        if (Thread.GetData(slot) == null)
        {
            Thread.SetData(slot, DateTime.Now.Millisecond);
        }

        Console.WriteLine(Thread.CurrentThread.ManagedThreadId + ":" + Thread.GetData(slot));
    });
}

Console.WriteLine("测试：CallContext.SetData");
for (var i = 0; i < 10; i++)
{
    Thread.Sleep(10);

    Task.Run(() =>
    {
        if (CallContext.GetData("test") == null)
        {
            CallContext.SetData("test", DateTime.Now.Millisecond);
        }

        Console.WriteLine(Thread.CurrentThread.ManagedThreadId + ":" + CallContext.GetData("test"));
    });
}

Console.WriteLine("测试：CallContext.SetData");
Task.Run(() =>
{
    CallContext.SetData("test", "段光伟");
    Console.WriteLine(Thread.CurrentThread.ManagedThreadId + ":" + CallContext.GetData("test"));

    Task.Run(() =>
    {
        Console.WriteLine(Thread.CurrentThread.ManagedThreadId + ":" + CallContext.GetData("test"));
    });
});

Thread.Sleep(100);

Console.WriteLine("测试：CallContext.LogicalSetData");
Task.Run(() =>
{
    CallContext.LogicalSetData("test", "段光伟");
    Console.WriteLine(Thread.CurrentThread.ManagedThreadId + ":" + CallContext.LogicalGetData("test"));

    Task.Run(() =>
    {
        Console.WriteLine(Thread.CurrentThread.ManagedThreadId + ":" + CallContext.LogicalGetData("test"));
    });

    ExecutionContext.SuppressFlow();
    Task.Run(() =>
    {
        Console.WriteLine("SuppressFlow 之后:" + CallContext.LogicalGetData("test"));
    });

    ExecutionContext.RestoreFlow();
    Task.Run(() =>
    {
        Console.WriteLine("RestoreFlow 之后:" + CallContext.LogicalGetData("test"));
    });
});