3

嗨，我对 c# 很陌生，所以对此表示歉意。

我试图创建一个文本文件来保存客户的详细信息。但我想用姓氏命名文本文件。即 myfile.txt。

我确定我很接近，但是在将 surname.text 更改为变量然后使其成为我创建的新文件的名称时缺少一些东西。

我在问题区域周围放置了 2 **。

private void button1_Click(object sender, EventArgs e)
{
    try
    {
        if ((tb_firstname.Text == "") || (tb_surname.Text == "") || (tb_postcode.Text == ""))
        {
            MessageBox.Show("Missing values from textboxes!");
        }
        else if (
               ****string myfile.txt = (tb_surname.Text);
               File.Exists("myfile.txt"));****
        {
                if (MessageBox.Show("Warning: file already exists. " + 
                                    "Contents will be replaced - " + 
                                     "do you want to continue?", "File Demo",
                                     MessageBoxButtons.YesNo, MessageBoxIcon.Question,
                                     MessageBoxDefaultButton.Button1,
                                     MessageBoxOptions.DefaultDesktopOnly) == 
                    DialogResult.Yes)
                {
                    //write lines of text to file
                    StreamWriter outputStream = File.CreateText(myfile.txt);
                    outputStream.WriteLine(tb_firstname.Text);
                    outputStream.WriteLine(tb_surname.Text);
                    outputStream.WriteLine(tb_surname.Text);
                    outputStream.Close();
                    MessageBox.Show("Text written to file successfully!");
                    this.Close();
                }
                else
                {
                    MessageBox.Show("Action cancelled existing file contents not replaced!");
                    this.Close();
                }
            }
            else
            {
                //write lines of text to file
                StreamWriter outputStream = File.CreateText("myFile.txt");
                outputStream.WriteLine(tb_firstname.Text);
                outputStream.WriteLine(tb_surname.Text);
                outputStream.WriteLine(tb_postcode.Text);
                outputStream.Close();
                MessageBox.Show("Text written to file successfully!");
                this.Close();
            }
        }
        catch (Exception problem)
        {
            MessageBox.Show("Program has caused an error - " + problem.ToString());
        }
}

任何帮助都会很棒！

4

2 回答 2

2

I believe you are trying to save the surname as part of the file name. You can generate the filename and check if it exists with the code below:

First generate the filename:

string fileName = string.Format("{0}File.txt", tb_surname.Text);

And then check it using the variable:

   File.Exists(fileName);
于 2012-11-22T21:30:49.287 回答
2

您正在创建一个myfile.txt每次调用的文件

StreamWriter outputStream = File.CreateText("myFile.txt");

那是您正在使用的字符串文字。

你有这行：

string myfile.txt = (tb_surname.Text)

它将文本框的内容读入一个名为myfile.txt. 然后，您需要在文件创建代码中使用它：

StreamWriter outputStream = File.CreateText(myFile.txt);

请注意，没有引号。

如果文件已经存在，这将覆盖文件 - 如果要追加，则需要使用以下方法：

StreamWriter outputStream = File.AppendText(myFile.txt);
于 2012-11-22T22:27:27.870 回答