C# 用C语言保存文本文件#
我正在尝试写记事本,如何知道用户是否单击了“取消”?我的代码不起作用:C# 用C语言保存文本文件#,c#,visual-studio-2010,C#,Visual Studio 2010,我正在尝试写记事本,如何知道用户是否单击了“取消”?我的代码不起作用: private void SaveAsItem_Click(object sender, EventArgs e) { saveFileDialog1.FileName = "untitled"; saveFileDialog1.Filter = "Text (*.txt)|*.txt"; saveFileDialog1.ShowDialog(); System.IO.StreamWriter
private void SaveAsItem_Click(object sender, EventArgs e)
{
saveFileDialog1.FileName = "untitled";
saveFileDialog1.Filter = "Text (*.txt)|*.txt";
saveFileDialog1.ShowDialog();
System.IO.StreamWriter SaveFile = new System.IO.StreamWriter(saveFileDialog1.FileName);
SaveFile.WriteLine(richTextBox1.Text);
SaveFile.Close();
if (DialogResult == DialogResult.Cancel)
{
richTextBox1.Text = "CANCEL";
issaved = false;
}
else
{
issaved = true;
}
}
您正在检查主窗体的
DialogResult
属性,但您要检查的是子窗体。所以
var dr = saveFileDialog1.ShowDialog();
if( dr == DialogResult.OK )
{
using(var SaveFile = new StreamWriter(saveFileDialog1.FileName))
{
SaveFile.WriteLine(richTextBox1.Text);
issaved = true;
}
}
else // cancel (or something else)
{
richTextBox1.Text = "CANCEL";
issaved = false;
}
此外,您应该像我上面所做的那样,使用块将
StreamWriter
包装在中。如果发生异常,代码将无法关闭文件。使用块是try/finally
块的语法糖,该块在finally
部分调用Dispose()
(反过来调用Close()
)。您正在检查主窗体的DialogResult
属性,但它是您要检查的子窗体。所以
var dr = saveFileDialog1.ShowDialog();
if( dr == DialogResult.OK )
{
using(var SaveFile = new StreamWriter(saveFileDialog1.FileName))
{
SaveFile.WriteLine(richTextBox1.Text);
issaved = true;
}
}
else // cancel (or something else)
{
richTextBox1.Text = "CANCEL";
issaved = false;
}
此外,您应该像我上面所做的那样,使用
块将StreamWriter
包装在中。如果发生异常,代码将无法关闭文件。使用块是try/finally
块的语法糖,该块在finally
部分调用Dispose()
(反过来调用Close()
)。在检查对话框结果之前,您正在创建文件。将SaveFile变量位移到“issaved=true”块中
[编辑]如其他人所说,在检查对话框结果之前,请正确检查对话框结果。将SaveFile变量位移到“issaved=true”块中
DialogResult res = saveFileDialog1.ShowDialog();
if (res == DialogResult.Cancel) {
// user cancelled
}
else {
// Write file to disk using the filename chosen by user
}
[编辑]如其他人所说,正确检查对话框结果
DialogResult res = saveFileDialog1.ShowDialog();
if (res == DialogResult.Cancel) {
// user cancelled
}
else {
// Write file to disk using the filename chosen by user
}