using Word = NetOffice.WordApi;

 Word.Document doc = this._wordApplication.Documents.Add(@"C:\Users\li\Desktop\新建文件夹 (3)\Doc1.docx");

 Word.ContentControl contentControl = doc.ContentControls.Add();

 contentControl.Title = "测试";

 contentControl.Tag = "test";

 object type = @"Excel.Sheet";//插入的excel

 contentControl.Range.InlineShapes.AddOLEObject(type);