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[英]How to get bool result from async task<bool> function in C# - Error: Cannot implicitly convert type `void' to `bool'
[英]How can out string values with Task<bool> function in C#
如何在C#中使用Task函數輸出字符串值,我需要修復此代碼才能返回沒有字符串值的Task
public Task<bool> DelUserTemp(string UserID, int FingerIndex ,out string result)
{
return Task.Run(() =>
{
if (true)
{
result = "done";
return true;
}
else
{
result = "error";
return false;
}
});
}
使用ref / out的替代方法是返回C#7.0元組 。
public Task<(bool Worked, string Result)> DelUserTemp(string UserID, int FingerIndex)
{
return Task.Run(() =>
{
if (true)
{
return (true, "done");
}
else
{
return (false, "error");
}
});
}
另一個示例是創建class
並返回它:
public class MyResult
{
public bool Succeeded {get;}
public string ErrorMessage {get;}
public MyResult(bool succeeded, string errorMessage)
{
Succeeded = succeeded;
ErrorMessage = errorMessage;
}
}
public Task<MyResult> DelUserTemp(string UserID, int FingerIndex ,out string result)
{
return Task.Run(() =>
{
if (true)
{
return new MyResult(true, "done");
}
else
{
return new MyResult(false, "error");
}
});
}
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