C#如何在文本文件中写入多行？
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C# how to write multiple lines in a text file?
提问by Ian Lundberg
I am trying to press a button that takes the text from textbox4 and textbox5 to write it to a text file. BUT when I press it again to add new info to the text file it just replaces the old text in with the new. How do I get it to write another line below the first one each time I press the button?
我正在尝试按下一个按钮，该按钮将 textbox4 和 textbox5 中的文本写入文本文件。但是当我再次按下它向文本文件添加新信息时，它只会用新文本替换旧文本。每次按下按钮时，如何让它在第一行下方写另一行？
This is the code I have so far
这是我到目前为止的代码
private void button5_Click(object sender, EventArgs e)
{
try
{
xuidspath = @"c:\xuids.txt";
ListViewItem lvi = new ListViewItem();
lvi.Text = textBox4.Text;
lvi.SubItems.Add(textBox5.Text);
listXuid.Items.Add(lvi);
TextWriter xuids = new StreamWriter(xuidspath);
xuids.WriteLine(textBox4.Text + "-" + textBox5.Text);
textBox5.Clear();
textBox4.Clear();
xuids.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
Any ideas?
有任何想法吗？
采纳答案by Rophuine
Open the file for append.
打开文件进行追加。
FileStream xuids = new FileStream(xuidspath, FileMode.Append);
回答by Digvijay
just use StringBuilder class and File.WriteXXX methods.
只需使用 StringBuilder 类和 File.WriteXXX 方法。
StringBuilder sb = new StringBuilder();
sb.AppendLine(textBox.Text + " " + textbox2.Text);
File.WriteAllText("c:\xuids.txt",sb.ToString();
回答by Joshua Enfield
Use an overload:
使用重载：
public StreamWriter(string path, bool append);
i.e
IE
TextWriter xuids = new StreamWriter(xuidspath,true);
回答by Gilles
Change:
改变：
TextWriter xuids = new StreamWriter(xuidspath);
To:
到：
TextWriter xuids = new StreamWriter(xuidspath, true);
The second parameter is append. From MSDN (http://msdn.microsoft.com/en-us/library/36b035cb.aspx) :
第二个参数是追加。从 MSDN ( http://msdn.microsoft.com/en-us/library/36b035cb.aspx) ：
Determines whether data is to be appended to the file. If the file exists and append is false, the file is overwritten. If the file exists and append is true, the data is appended to the file. Otherwise, a new file is created.
确定是否将数据附加到文件中。如果文件存在且 append 为 false，则文件将被覆盖。如果文件存在且 append 为真，则将数据附加到文件中。否则，将创建一个新文件。
回答by Aref Khandan
RichTextBox rch = new RichTextBox();
rch.Text = cmn;
foreach (string l in rch.Lines)
strw.WriteLine(l);
