如何获取embedded在excel中的对象C＃

我有一个应用程序，我需要得到embedded在Excel中的对象应通过代码存储在某个位置。

connection.Close(); //connection.ResetState(); string embeddingPartString; //ArrayList chkdLstEmbeddedFiles = new ArrayList(); ; List<String> chkdLstEmbeddedFiles = new List<string>(); //string fileName = txtSourceFile.Text; if (filepath == string.Empty || !System.IO.File.Exists(filepath)) { return; } // Open the package file pkg = Package.Open(filepath, FileMode.Open, FileAccess.ReadWrite); System.IO.FileInfo fi = new System.IO.FileInfo(filepath); string extension = fi.Extension.ToLower(); if ((extension == ".docx") || (extension == ".dotx") || (extension == ".docm") || (extension == ".dotm")) { embeddingPartString = "/word/embeddings/"; } else if ((extension == ".xlsx") || (extension == ".xlsm") || (extension == ".xltx") || (extension == ".xltm")) { embeddingPartString = "/xl/embeddings/"; } else { embeddingPartString = "/ppt/embeddings/"; } // Get the embedded files names. foreach (PackagePart pkgPart in pkg.GetParts()) { if (pkgPart.Uri.ToString().StartsWith(embeddingPartString)) { string fileName1 = pkgPart.Uri.ToString().Remove(0, embeddingPartString.Length); chkdLstEmbeddedFiles.Add(fileName1); } } //pkg.Close(); if (chkdLstEmbeddedFiles.Count == 0) //MessageBox.Show("The file does not contain any embedded files."); // Open the package and loop through parts // Check if the part uri to find if it contains the selected items in checked list box pkg = Package.Open(filepath); foreach (PackagePart pkgPart in pkg.GetParts()) { for (int i = 0; i < chkdLstEmbeddedFiles.Count; i++) { object chkditem = chkdLstEmbeddedFiles[i]; if (pkgPart.Uri.ToString().Contains(embeddingPartString + chkdLstEmbeddedFiles[i].ToString())) { // Get the file name string fileName1 = pkgPart.Uri.ToString().Remove(0, embeddingPartString.Length); // Get the stream from the part System.IO.Stream partStream = pkgPart.GetStream(); //string filePath = txtDestinationFolder.Text + "\\" + fileName1; // Write the steam to the file. Environment.GetEnvironmentVariable("userprofile"); System.IO.FileStream writeStream = new System.IO.FileStream(@"C:\Users\jyshet\Documents\MicrosoftDoc_File.docx", FileMode.Create, FileAccess.Write); ReadWriteStream(pkgPart.GetStream(), writeStream); // If the file is a structured storage file stored as a oleObjectXX.bin file // Use Ole10Native class to extract the contents inside it. if (fileName1.Contains("oleObject")) { // The Ole10Native class is defined in Ole10Native.cs file // Ole10Native.ExtractFile(filePath, txtDestinationFolder.Text); } } } } pkg.Close(); 

我只能下载doc文件，其余的不像txt和mht文件。 请build议在这种情况下做什么。 我的问题是embedded在Excel中的任何对象应通过代码下载并保存在目标中。