1.引入Microsoft.Office.Interop.Word
2.
Microsoft.Office.Interop.Word._Application app = new Microsoft.Office.Interop.Word.Application();
Microsoft.Office.Interop.Word._Document doc = null;
3.
object unknow = Type.Missing;
object o = (object)filePath;
4.
doc = app.Documents.Open(ref o,
ref unknow, ref unknow, ref unknow, ref unknow, ref unknow,
ref unknow, ref unknow, ref unknow, ref unknow, ref unknow,
ref unknow, ref unknow, ref unknow, ref unknow, ref unknow);
StringBuilder sb = new StringBuilder();
//正文
sb.Append(doc.StoryRanges[Microsoft.Office.Interop.Word.WdStoryType.wdMainTextStory].Text);
//文本框
sb.Append(doc.StoryRanges[Microsoft.Office.Interop.Word.WdStoryType.wdTextFrameStory].Text);
textBox1.Text = sb.ToString();