检查变量的数据类型是否为double [英] Checking if a variable is of data type double

问题描述

我需要检查我拥有的变量是否为数据类型 double 。这是我尝试的方法：

I need to check if a variable I have is of the data type double. This is what I tried:

try
{
    double price = Convert.ToDouble(txtPrice.Text);
}
catch (FormatException)
{
    MessageBox.Show("Product price is not a valid price", "Product price error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    return false;
}

我以为这样可以，但是很明显，我没意识到 txtPrice.Text 除了数字外，其他任何内容， Convert 类都将解析出来。

I thought this would work, but obviously, I failed to realize if txtPrice.Text had anything other than a number in it, the Convert class will just parse it out.

如何切实地检查变量是否为双精度值？

How can I realiably check if a variable is a double?

推荐答案

使用此命令：

double price;
bool isDouble = Double.TryParse(txtPrice.Text, out price);
if(isDouble) {
  // double here
}

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