C# => 运算符？

Question

我对 C# 中的 => 运算符有疑问。

我正在查看 Expression Blend 4 样本。联系人示例中有一行，其中包括:

//In C:\Program Files (x86)\Microsoft Expression\Blend 4\Samples\en\Contacts\
//Contacts\ViewModels\ContactsViewModel.cs: 

contactDetailWindow.Closed += (o, e) =>
{                              
   finishedCallback(contactDetailWindow.DialogResult);

   // Or, C:\Program Files (x86)\Microsoft Expression\Blend 4\Samples\en\
   // Contacts\Contacts\ViewModels\ContactsViewModel.cs
   this.EditContact(newContact, dialogResult =>
   {
        if (dialogResult.HasValue && dialogResult.Value)
        {
        this.Contacts.Add(newContact);
        }
   });
};

=> 运算符实际上在做什么？它是否覆盖了某些东西？

Answer 1

它叫做 lambda operator .

 b.Click += (s, e) => Log("Sender :" + s + "EventArgs " + e);

等同于

b.Click += b_Click;

void b_Click(object sender, EventArgs e)
{
    Log("Sender :" + sender + "EventArgs " + e);
}

或

b.Click += delegate(object sender, EventArgs e) 
           { 
               Log("Sender :" + sender + "EventArgs " + e);  
           };