问题描述
有问题的文本框包含在我的代码中的 if 语句中,其效果是
The text box in question is involved in an if statement within my code, something to the effect of
if (textbox.text != "") { do this }
我很好奇空文本框是否会被视为空字符串或空语句.
I am curious if an empty text box will be considered an empty string or a null statement.
推荐答案
尝试使用 IsNullOrWhiteSpace,这将确保验证空白也无需修剪.
Try to use IsNullOrWhiteSpace, this will make sure of validating the whitespace too without having to trim it.
if (!string.IsNullOrWhiteSpace(textbox.Text)) { //code here }
根据文档 string.IsNullOrWhiteSpace 计算结果为:
According to documentation string.IsNullOrWhiteSpace evaluates to:
return String.IsNullOrEmpty(value) || value.Trim().Length == 0;
String.IsNullOrWhiteSpace:
指示指定的字符串是否为空、空或仅由空白字符组成.
Indicates whether a specified string is null, empty, or consists only of white-space characters.