c# - Streamwriter is clearing the text from my text file then updating

Question

I'm trying to get my streamwriter to add text onto the end of the text file but for some reason, it is just replacing the text with whatever I have entered. Any help is appreciated to fix this.

StreamWriter sw = new StreamWriter(Server.MapPath("~") + "/App_Data/blogMessages.txt");
sw.WriteLine(postTextBox.Text);
sw.Close();

Answer 1

您可以对流编写器使用覆盖的方法

StreamWriter sw = new StreamWriter(Server.MapPath("~") + "/App_Data/blogMessages.txt", true);

这将附加您的文本

Answer 2

您需要使用带有额外参数的StreamWriter 构造函数的重载版本来配置覆盖或附加到流。请添加 using 语句

using(StreamWriter sw = new StreamWriter(Server.MapPath("~") + 
                        "/App_Data/blogMessages.txt", true))
{

     sw.WriteLine(postTextBox.Text);

}

using 语句允许正确关闭和处理流，以防您在打开或写入时遇到异常

Answer 3

尝试这个

 using (System.IO.TextWriter tw = new System.IO.StreamWriter(@"D:\TEMP\IEALog\path.txt", true))
        {
            tw.WriteLine(message + "Source ;- " + source + "StackTrace:- " + exc.StackTrace.ToString());
        }