.text =="" vs .length == 0

if（pstrString == null || pstrString.Length == 0） //在这里执行操作。 原因是你不能保证总是持有 参考nce到字符串。现在你关于如何使用null 引用的逻辑可能与其他引用不同，但你应该把它带到 考虑。 另外，TextBox类可能总是返回一个空字符串，其中 的情况下，我只是检查长度（它应该比检查 对比更快）空字符串，你应该使用String.Empty来表示。 希望这会有所帮助。 - - 尼古拉斯Paldino [.NET / C＃MVP] - 尼克（点）paldino =在= exisconsulting<点> COM " j_ruez" <Ĵ_ **** @ yahoo.com>在留言中写道 news：17 ************************** @ posting.google.c om ... 我正在尝试学习在c中做一些事情的最佳方法＃ 在测试空字符串时，测试它的最佳方法是什么。例如，如果我有一个名为txtValue的文本框 我是否应该使用 txtValue.Text =="" 或 txtValue.Length == 0 为什么我会使用一个而不是另一个。如果没关系，也让我知道。 谢谢 最高性能的方法是检查长度== 0. - 米奇威廉姆斯 作者，Microsoft Visual C＃ .NET Core Reference，MS Press www.servergeek.com " Tobin Harris" <共********** @ hotmail.com>在消息中写道 news：bl ************ @ ID-135366.news.uni-berlin.de ... " ; j_ruez" <Ĵ_ **** @ yahoo.com>在消息中写道新闻：17 ************************** @ posting.google.c om ... 测试空字符串时，测试它的最佳方法是什么。例如，如果我有一个名为txtValue的文本框 我应该使用 txtValue.Text =="" txtValue.Length == 0 更具描述性，可能是平台安全的方式： txtValue.Text == string.Empty 但是，请记住，字符串也可以为null，所以你可以想要检查这个！ 托宾 I am trying to learn the best ways to do some things in c#When testing for an empty string, what is the best way to test it.For example, if I have a textbox named txtValueShould I usetxtValue.Text == ""ortxtValue.Length == 0and why would I use one over the other. And if it doesn''t matter,just let me know that also.Thanks 解决方案 "j_ruez" <j_****@yahoo.com> wrote in messagenews:17**************************@posting.google.c om... When testing for an empty string, what is the best way to test it. For example, if I have a textbox named txtValue Should I use txtValue.Text == "" or txtValue.Length == 0A more descriptive, and potentially platform-safe way could be this:txtValue.Text == string.EmptyHowever, bear in mind that strings can also be null, so you may want tocheck this also!Tobinj_ruez,I personally would use the following when working with strings ingeneral:if (pstrString == null || pstrString.Length == 0)// Perform operation here.The reason for this is that you are not guaranteed to always hold areference to the string. Now your logic for what to do with a nullreference might be different than others, but you should take it intoconsideration.Also, the TextBox class might always return an empty string, in whichcase, I would just check the length (it should be quicker than checkingagainst the empty string, which you should use "String.Empty" for as well).Hope this helps.--- Nicholas Paldino [.NET/C# MVP]- nick(dot)paldino=at=exisconsulting<dot>com"j_ruez" <j_****@yahoo.com> wrote in messagenews:17**************************@posting.google.c om... I am trying to learn the best ways to do some things in c# When testing for an empty string, what is the best way to test it. For example, if I have a textbox named txtValue Should I use txtValue.Text == "" or txtValue.Length == 0 and why would I use one over the other. And if it doesn''t matter, just let me know that also. ThanksThe most performant way is to check for Length == 0.--Mickey WilliamsAuthor, "Microsoft Visual C# .NET Core Reference", MS Press www.servergeek.com"Tobin Harris" <co**********@hotmail.com> wrote in messagenews:bl************@ID-135366.news.uni-berlin.de... "j_ruez" <j_****@yahoo.com> wrote in message news:17**************************@posting.google.c om... When testing for an empty string, what is the best way to test it. For example, if I have a textbox named txtValue Should I use txtValue.Text == "" or txtValue.Length == 0 A more descriptive, and potentially platform-safe way could be this: txtValue.Text == string.Empty However, bear in mind that strings can also be null, so you may want to check this also! Tobin 这篇关于.text ==&quot;&quot; vs .length == 0的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！