如何验证用户输入是否为整数? [英] How to validate user input for whether it's an integer?

问题描述

它告诉我它不能将 int 转换为 bool.尝试过 TryParse 但由于某种原因参数列表无效.

It tells me that it can't convert int to bool. Tried TryParse but for some reason the argument list is invalid.

代码:

private void SetNumber(string n)
{
    // if user input is a number then
    if (int.Parse(n)) 
    {
        // if user input is negative
        if (h < 0)
        {
            // assign absolute version of user input
            number = Math.Abs(n); 
        }
        else 
        {
            // else assign user input
            number = n;
        }
    }
    else
    {
        number = 0; // if user input is not an int then set number to 0  
    }
}

推荐答案

您可能非常接近使用 TryParse，但我猜您忘记了 out 关键字参数:

You were probably very close using TryParse, but I'm guessing you forgot the out keyword on the parameter:

int value;
if (int.TryParse(n, out value))
{

}

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