我的string.replace（）不能在我的类文件中工作 [英] My string.replace() won't work in my class file

问题描述

最近我在创建一个HTML格式的电子邮件给客户预订信息的任务。



我之前在页面返回代码中做过，但现在我需要使用一个没有从默认页面继承的类文件来创建这个html格式的电子邮件。



然后，我发现我的string.replace（）不会在我的班级文件中工作。





我创建了一个项目，在我的数据文件中，我格式化了我的电子邮件，我使用的所有动态信息## information ##持有它。



然后我用string.replace（oldstring，newstring）替换## information ##这个占位符，但它发送我的电子邮件，但不会替换数据。





只是为了确保它能够正常工作然后我才能真正发挥作用生活项目，所以在附件中我的测试项目你不介意看看为什么string.replace（）不起作用吗？

In recently I work on the task to create a HTML format email to client the booking information.

I did it before in page back code,but now I need use a class file that didn't inherit from default page to create this html format email.

Then, I found that my string.replace()won't work in my class file.


I create a project and in my Data file I format my email, all the dynamic information I use ##information## to holder it.

Then I use string.replace(oldstring,newstring) to replace "##information##" this placeholder, but it send my email, but won't replace the Data.


Just for make sure it work then I going to put on my real life project, so in the attachment is my test project won't you mind see why the string.replace()won't work?

public static void GenerateEmails()
        {

            string body_confirmation;

            // For customer confirmation
            using (StreamReader reader = new StreamReader(System.Web.HttpContext.Current.Server.MapPath("~/Data/EmailCustomerConfirm.htm")))
            {
                body_confirmation = reader.ReadToEnd();
            }
            //System.Web.HttpContext.Current.Response.Write(body_confirmation);
            body_confirmation.Replace("##comfirmStates##", "You have submitted the following booking:");
            body_confirmation.Replace("##Customer##", "[e-mail]");
            body_confirmation.Replace("##Job No#", "Job No");
            body_confirmation.Replace("##Reference##", "Reference");
            body_confirmation.Replace("##PassengerName##", "Sandy");
            body_confirmation.Replace("##PassengerNumber##", "Sandy passenger Number");
            body_confirmation.Replace("##Contact Phone##", "contact phone");
            MailMessage myMessage = new MailMessage();
            myMessage.Subject = "Response from web site";
            myMessage.Body = body_confirmation;
            myMessage.IsBodyHtml = true;
            myMessage.From = new MailAddress("[e-mail]", "web site");
            myMessage.To.Add(new MailAddress("[e-mail]", "sandy zhang"));
            var mySmtpClient = new SmtpClient();
            mySmtpClient.Send(myMessage);

编辑（Matt T Heffron）：更改为虚拟电子邮件地址以保护垃圾邮件。

EDIT (Matt T Heffron): Changed to dummy email address for spam protection.

推荐答案

.NET中的字符串是不可变的。你需要保留从Replace方法返回的字符串。

String in .NET is immutable. You need to keep the returned string from Replace method.

body_confirmation = body_confirmation.Replace("##comfirmStates##", "You have submitted the following booking:");

.NET中的字符串是不可变的！

string.Replace（） 不修改字符串。它返回一个带有替换的新字符串。

尝试：

strings in .NET are immutable!
string.Replace() does not modify the string in place. It returns a new string with the replacement(s) performed.
Try:

body_confirmation = body_confirmation.Replace("##comfirmStates##", "You have submitted the following booking:");
body_confirmation = body_confirmation.Replace("##Customer##", "[e-mail]");
body_confirmation = body_confirmation.Replace("##Job No#", "Job No");
body_confirmation = body_confirmation.Replace("##Reference##", "Reference");
body_confirmation = body_confirmation.Replace("##PassengerName##", "Sandy");
body_confirmation = body_confirmation.Replace("##PassengerNumber##", "Sandy passenger Number");
body_confirmation = body_confirmation.Replace("##Contact Phone##", "contact phone");

或

OR

body_confirmation = body_confirmation.Replace("##comfirmStates##", "You have submitted the following booking:")
          .Replace("##Customer##", "[e-mail]")
          .Replace("##Job No#", "Job No")
          .Replace("##Reference##", "Reference")
          .Replace("##PassengerName##", "Sandy")
          .Replace("##PassengerNumber##", "Sandy passenger Number")
          .Replace("##Contact Phone##", "contact phone");

Hi Matt T Heffron，



它的确有效，非常感谢。你救了我的命。





很好理解string.Replace（）现在如何工作。

Hi Matt T Heffron,

It works, Thanks very much. You saved my life.


Very good that understand how string.Replace()work now.

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