一个函数返回多个值 C#
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Public void GetValues(string UserID,string PassWord,out string string UserName,out bool flag)
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{
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//在使用一些判断为返回值赋值时,最好先在判断外赋上初始值,否则易报“离开当前方法之前必须对out 参数赋值”错误
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UserName = "";
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flag = true;
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if(UserID == 1 && Password == "123")
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{
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UserName = "小白";
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}
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else
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{
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flag = false;
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}
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}
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private void btnLogin_Click(object sender, System.Web.UI.ImageClickEventArgs e)
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{
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//先对返回的参数进行声明
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string Name;
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string UserName;
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bool Flag;
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GetValues("1","123",out Name, out Flag);
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//此时Name和Flag的值已返回
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//Name = "小白"
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//Flag = true
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if(Flag == true)
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{
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UserName = Name;
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//UserName被赋值为小白
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}
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}
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out 关键字会导致参数通过引用来传递。这与 ref 关键字类似,不同之处在于 ref 要求变量必须在传递之前进行初始化。若要使用 out 参数,方法定义和调用方法都必须显式使用 out 关键字。尽管作为 out 参数传递的变量不需要在传递之前进行初始化,但需要调用方法以便在方法返回之前赋值。ref 和 out 关键字在运行时的处理方式不同,但在编译时的处理方式相同。因此,如果一个方法采用 ref 参数,而另一个方法采用 out 参数,则无法重载这两个方法。
参考MSDN