C#/.NET开发问题

C# compile error: quot;Invoke or BeginInvoke cannot be called on a control until the window handle has been created.quot;(C# 编译错误:“在创建窗口句柄之前,不能对控件调用 Invoke 或 BeginInvoke.)
Type of conditional expression cannot be determined (Func)(无法确定条件表达式的类型 (Func))
In .NET, what is the internal implementation of a delegate?(在 .NET 中,委托的内部实现是什么?)
Func delegate with ref variable(带有 ref 变量的函数委托)
What#39;s the point of a lambda expression?(lambda 表达式的意义何在?)
What are the advantages of delegates?(代言人有什么好处?)
Simple Delegate (delegate) vs. Multicast delegates(简单委托(委托)与多播委托)
MethodInvoker vs Action for Control.BeginInvoke(Control.BeginInvoke 的 MethodInvoker 与 Action)
How can I clear event subscriptions in C#?(如何在 C# 中清除事件订阅?)
C# Generics won#39;t allow Delegate Type Constraints(C# 泛型不允许委托类型约束)
Is it possible to have a delegate as attribute parameter?(是否可以将委托作为属性参数?)
Is Delegate.EndInvoke() really necessary?(Delegate.EndInvoke() 真的有必要吗?)