Question

我用C#编文本编辑器，想用openFileDialog打开doc格式的文件，在richtextbox 中显示出来

比如源程序中
openFileDialog1.RestoreDirectory = true;
if ((openFileDialog1.ShowDialog() == DialogResult.OK) && openFileDialog1.FileName != "")
{
richTextBox1.LoadFile(openFileDialog1.FileName);，但是总是无法打开word啊，说总是文件格式错误

Answer 1

richTextBox1不能打开word文件的，只能将word文件转换成.rtf格式的文件才能载入richTextBox1中。
下面是将word文件转换成.rtf格式的C#代码，希望对你有帮助。

OpenFileDialog f = new OpenFileDialog();
if ((f.ShowDialog() == DialogResult.OK) && f.FileName != "")
{
//创建一个word的实例
Microsoft.Office.Interop.Word.Application newApp = new Microsoft.Office.Interop.Word.Application();
// 指定源文件和目标文件
object Source = f.FileName;
object Target = f.FileName.Replace(".doc", ".rtf");

object Unknown = Type.Missing;

// 打开要转换的Word文件
newApp.Documents.Open2000(ref Source, ref Unknown,
ref Unknown, ref Unknown, ref Unknown,
ref Unknown, ref Unknown, ref Unknown,
ref Unknown, ref Unknown, ref Unknown,
ref Unknown);

// 指定文档的类型
object format = Microsoft.Office.Interop.Word.WdSaveFormat.wdFormatRTF;

//改变文档类型
newApp.ActiveDocument.SaveAs2000(ref Target, ref format,
ref Unknown, ref Unknown, ref Unknown,
ref Unknown, ref Unknown, ref Unknown,
ref Unknown, ref Unknown, ref Unknown);

//关闭word实例
newApp.Quit(ref Unknown, ref Unknown, ref Unknown);
}

Answer 2

需要创建实例，以及文件需要转化

Answer 3

openFileDialog1.Filter = "文本文件(*.txt)|*.txt|RTF文件|*.rtf|所有文件(*.*)|*.*";
openFileDialog1.FilterIndex = 1;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
try
{
string filename = openFileDialog1.FileName;
string fileext = new System.IO.FileInfo(filename).Extension;
switch (fileext.ToLower())
{

case ".txt":
this.richTextBox1.LoadFile(filename, RichTextBoxStreamType.PlainText);
break;
case ".rtf":
this.richTextBox1.LoadFile(filename, RichTextBoxStreamType.RichText);
break;

}

}
catch (Exception)
{
MessageBox.Show("Oh，您的打开不成功！");
}
}