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概念委托是一种引用方法的类型,委托类似于 C++ 函数指针,但它是类型安全的。一旦为委托分配了方法,委托将与该方法具有完全相同的行为。委托方法的使用可以像其他任何方法一样,具有参数和返回值,如下面的示例所示:[代码]与委托的签名(由返回类型和参数组成)匹配的任何方法都可以分配给该委托。这样就可以通过编程方式来更改方法调用,还可以向现有类中插入新代码。只要知道委托的签名,便可以分配自己的委托方法。将... 阅读全文
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The following error must be resolved before you can continue the installation process:Failed to connect to your MySQL database server. MySQL reports the following message: A connection attempt failed ... 阅读全文
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1.首先试最常规的方法:Clean and then rebuild solution,但是没有解决2.进入Tools>Options,选择Debugging>General 却掉 Enable address-level debugging 选项,在去掉 Require source files to exactly match the original version.Okay,解... 阅读全文
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Server Error in '/SohemaOnionLakeConfig.Web' Application. Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the cli... 阅读全文