收到错误消息 - 无法类型“string”隐式转换为“布尔” [英] Getting Error Msg - Cannot implicitly convert type 'string' to 'bool'

问题描述

我检查值一个文本框来触发条件语句，但我收到错误消息。

I am checking for values in a textbox to trigger a conditional statement, but am getting error messages.

if (txtAge.Text = "49") || (txtAge.Text = "59")
{
    txtNote.Text = "A valid picture ID must be submitted";
}

我得到该错误消息的无法隐式转换类型'字符串到布尔的

我怎样才能解决这个问题？

How can I resolve this?

推荐答案

当你输入：

if (txtAge.Text = "49")

这基本上都是指派49给 txtAge.Text ，然后。返回的值作为字符串（等于49）

This basically is assigning "49" to txtAge.Text, and then returning that value as a string (equal to "49").

这是一样的，从本质上讲，是这样做的：

This is the same, essentially, as doing:

string tmp = txtAge.Text = "49";
if (tmp) { //...

但是，你不能这样做，如果（stringExpression），因为if语句只适用于一个布尔值。你最有可能想输入：

However, you cannot do "if (stringExpression)", since an if statement only works on a boolean. You most likely wanted to type:

if (txtAge.Text == "49" || txtAge.Text == "59")
{

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