在C#"帮助固定的错误; ref或out参数必须是可分配的" [英] Help fixing errors in C# "A ref or out argument must be an assignable"
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问题描述
下面是我在与错误的代码块:
公共静态布尔闪存(表格形式)
{
返回(Win2000OrLater&放大器;&放大器; FlashWindowEx(参照Create_FLASHWINFO(form.Handle,15,uint.MaxValue,0))); // ref或out参数必须是可分配的变量
}
公共静态布尔闪存(表格的形式,UINT计数)
{
返回(Win2000OrLater&安培;&安培; FlashWindowEx(REF Create_FLASHWINFO(form.Handle,3,计数,0))); // ref或out参数必须是可分配的变量
}
私人静态外部布尔FlashWindowEx(REF FLASHWINFO pwfi);
公共静态布尔开始(表格形式)
{
回报率(Win2000OrLater&安培;&安培; FlashWindowEx(REF Create_FLASHWINFO(form.Handle,3,uint.MaxValue,0))); // ref或out参数必须是可分配的变量
}
公共静态布尔停止(Form表单)
{
回报率(Win2000OrLater&安培;&安培; FlashWindowEx (参照Create_FLASHWINFO(form.Handle,0,uint.MaxValue,0))); // ref或out参数必须是可分配的变量
}
私人静态布尔Win2000OrLater
{
得到
{
收益率( Environment.OSVersion.Version.Major> = 5);
}
}
错误消息是:
ref或out参数必须是可分配
块引用>
解决方案关于你的第一个错误,你需要1.产品的FlashWindow作为一个变量,以便例如:
这:
公共静态布尔闪存(表格形式)
{
回报率(Win2000OrLater&安培;&安培; FlashWindowEx(REF Create_FLASHWINFO(form.Handle,15 ,uint.MaxValue,0))); // ref或out参数必须是可分配的变量
}
变为:
公共静态布尔闪存(表格形式)
{
如果(Win2000OrLater)
{
FLASHWINFO音响= Create_FLASHWINFO(form.Handle,15,uint.MaxValue,0);
回报率(FlashWindowEx(参考FI));
}
返回FALSE;
}
Here's a block of code I'm having errors with:
public static bool Flash(Form form) { return (Win2000OrLater && FlashWindowEx(ref Create_FLASHWINFO(form.Handle, 15, uint.MaxValue, 0))); //A ref or out argument must be an assignable variable } public static bool Flash(Form form, uint count) { return (Win2000OrLater && FlashWindowEx(ref Create_FLASHWINFO(form.Handle, 3, count, 0))); //A ref or out argument must be an assignable variable } private static extern bool FlashWindowEx(ref FLASHWINFO pwfi); public static bool Start(Form form) { return (Win2000OrLater && FlashWindowEx(ref Create_FLASHWINFO(form.Handle, 3, uint.MaxValue, 0))); //A ref or out argument must be an assignable variable } public static bool Stop(Form form) { return (Win2000OrLater && FlashWindowEx(ref Create_FLASHWINFO(form.Handle, 0, uint.MaxValue, 0))); //A ref or out argument must be an assignable variable } private static bool Win2000OrLater { get { return (Environment.OSVersion.Version.Major >= 5); } }
The error message is:
A ref or out argument must be an assignable
解决方案Regarding your first errors, you need to introduct the FlashWindow as a variable so for example
This:
public static bool Flash(Form form) { return (Win2000OrLater && FlashWindowEx(ref Create_FLASHWINFO(form.Handle, 15, uint.MaxValue, 0))); //A ref or out argument must be an assignable variable }
becomes:
public static bool Flash(Form form) { if (Win2000OrLater) { FLASHWINFO fi = Create_FLASHWINFO(form.Handle, 15, uint.MaxValue, 0); return (FlashWindowEx(ref fi)); } return false; }
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