通过C＃获取创buildExcel的错误：转换到COM上下文0x56b098

我想创build一个Excel文件通过C＃代码和情况是，我有一个存储过程返回15000条logging，我通过SqlDataAdapter读取数据，然后数据填充在DataTable ，然后我填写数据到Excel文件，但过了一段时间，应用程序抛出错误。

错误：

转换到COM上下文0x56b098此RuntimeCallableWrapper失败，出现以下错误：系统调用失败。 （从HRESULTexception：0x80010100（RPC_E_SYS_CALL_FAILED））。 这通常是因为创build此RuntimeCallableWrapper的COM上下文0x56b098已断开连接，或者正在忙于执行其他操作。 从当前COM上下文（COM上下文0x56af28）释放接口。 这可能会导致损坏或数据丢失。 为了避免这个问题，请确保所有COM上下文/公寓/线程都保持活动状态，并且可用于上下文转换，直到应用程序完全使用表示其内部的COM组件的RuntimeCallableWrappers完成。

以下是我正在使用的代码

 public DataTable getData(string query,string year,string month) { SqlDataAdapter da = new SqlDataAdapter(); DataTable dt = new DataTable(); SqlCommand cmd = new SqlCommand(query,con); cmd.Parameters.AddWithValue("@YR", year); cmd.Parameters.AddWithValue("@MN", month); cmd.CommandType = CommandType.StoredProcedure; cmd.CommandTimeout = 0; da.SelectCommand = cmd; da.Fill(dt); return dt; } 

主要方法

 private void btn_MRRRetention_Click(object sender, EventArgs e) { // Working for creating MRR Retention Excel File DataTable dt_Mrr; string Yr, mn; int tot_rows; Yr = Cmb_Yr.SelectedItem.ToString(); mn = Cmb_Mnth.SelectedItem.ToString(); if (xlApp == null) { MessageBox.Show("Excel is not properly installed!"); return; } excel.Workbook xlWorkBook; excel.Worksheet xlWorkSheet; object misValue = System.Reflection.Missing.Value; xlWorkBook = xlApp.Workbooks.Add(misValue); xlWorkSheet = (excel.Worksheet)xlWorkBook.Worksheets.get_Item(1); // Data Reader Code start for collecting data from DB and pasting into Excel pictureBox2.Visible = true; dt_Mrr = func.getData("sp_MRR_Retention_APAC", Yr, mn); //string text = "exec sp_Mrr_Retention" + "'" + Yr + "','" + mn + "'"; tot_rows = dt_Mrr.Rows.Count; int row = 2; int i=0; xlWorkSheet.Cells[1, 1] = "MONTH"; xlWorkSheet.Cells[1, 2] = "Parent Name"; xlWorkSheet.Cells[1, 3] = "Customer_Name"; xlWorkSheet.Cells[1, 4] = "Customer_Account_No"; xlWorkSheet.Cells[1, 5] = "Item_Category"; xlWorkSheet.Cells[1, 6] = "Item_Description_Summary"; xlWorkSheet.Cells[1, 7] = "Item_Number"; xlWorkSheet.Cells[1, 8] = "Date_Range"; xlWorkSheet.Cells[1, 9] = "Activity_Type"; xlWorkSheet.Cells[1, 10] = "Line_Type"; xlWorkSheet.Cells[1, 11] = "IBX_Code"; xlWorkSheet.Cells[1, 12] = "IBX_Country"; xlWorkSheet.Cells[1, 13] = "IBX_Region"; xlWorkSheet.Cells[1, 14] = "Primary_Sales_Rep"; xlWorkSheet.Cells[1, 15] = "MRC_Amount_USD_Budget_Rate"; xlWorkSheet.Cells[1, 16] = "Entered_Currency_Code"; xlWorkSheet.Cells[1, 17] = "MRC_Amount_LC"; xlWorkSheet.Cells[1, 18] = "UCM ID"; xlWorkSheet.Cells[1, 19] = "GAM_TAG"; xlWorkSheet.Cells[1, 20] = "Client Services Manager"; xlWorkSheet.Cells[1, 21] = "Sales Program Type"; xlWorkSheet.Cells[1, 22] = "SFDC Account Id"; xlWorkSheet.Cells[1, 23] = "Account Owner"; //rs = func.getReader("sp_MRR_Retention '" + Yr + "','" + mn + "'"); while (tot_rows>i) { xlWorkSheet.Cells[row, 1] = dt_Mrr.Rows[i]["MONTH"]; xlWorkSheet.Cells[row, 2] = dt_Mrr.Rows[i]["Parent Name"]; xlWorkSheet.Cells[row, 3] = dt_Mrr.Rows[i]["Customer_Name"]; xlWorkSheet.Cells[row, 4] = dt_Mrr.Rows[i]["Customer_Account_No"]; xlWorkSheet.Cells[row, 5] = dt_Mrr.Rows[i]["Item_Category"]; xlWorkSheet.Cells[row, 6] = dt_Mrr.Rows[i]["Item_Description_Summary"]; xlWorkSheet.Cells[row, 7] = dt_Mrr.Rows[i]["Item_Number"]; xlWorkSheet.Cells[row, 8] = dt_Mrr.Rows[i]["Date_Range"]; xlWorkSheet.Cells[row, 9] = dt_Mrr.Rows[i]["Activity_Type"]; xlWorkSheet.Cells[row, 10] = dt_Mrr.Rows[i]["Line_Type"]; xlWorkSheet.Cells[row, 11] = dt_Mrr.Rows[i]["IBX_Code"]; xlWorkSheet.Cells[row, 12] = dt_Mrr.Rows[i]["IBX_Country"]; xlWorkSheet.Cells[row, 13] = dt_Mrr.Rows[i]["IBX_Region"]; xlWorkSheet.Cells[row, 14] = dt_Mrr.Rows[i]["Primary_Sales_Rep"]; xlWorkSheet.Cells[row, 15] = dt_Mrr.Rows[i]["MRC_Amount_USD_Budget_Rate"]; xlWorkSheet.Cells[row, 16] = dt_Mrr.Rows[i]["Entered_Currency_Code"]; xlWorkSheet.Cells[row, 17] = dt_Mrr.Rows[i]["MRC_Amount_LC"]; xlWorkSheet.Cells[row, 18] = dt_Mrr.Rows[i]["UCM ID"]; xlWorkSheet.Cells[row, 19] = dt_Mrr.Rows[i]["GAM_TAG"]; xlWorkSheet.Cells[row, 20] = dt_Mrr.Rows[i]["Client Services Manager"]; xlWorkSheet.Cells[row, 21] = dt_Mrr.Rows[i]["Sales Program Type"]; xlWorkSheet.Cells[row, 22] = dt_Mrr.Rows[i]["SFDC Account Id"]; xlWorkSheet.Cells[row, 23] = dt_Mrr.Rows[i]["Account Owner"]; row++; i++; //For Checking purpose! //if (i == 1000) //{ // break; //} } // Data Reader Code Ends Here xlWorkBook.SaveAs("D:\\MRR_Retention_Auto.xls", excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue); xlWorkBook.Close(true, misValue, misValue); xlApp.Quit(); releaseObject(xlWorkSheet); releaseObject(xlWorkBook); releaseObject(xlApp); pictureBox2.Visible = false; MessageBox.Show("Excel file created , you can find the file D:\\MRR_Retention_Auto.xls"); } 

我需要帮助解决这个问题，并期待它。

Answer 1

在我看来，通过完全删除数据表，您可能会获得很多效率。 Datatables很好，但是它们确实有开销，我不知道在数据表中填充15,000行的开销是否会影响你的COM通信。

这是一个避免数据表的解决scheme。 它的前提是存储过程将按照您希望在Excel中看到的顺序转储列。

首先，让你的getData方法返回一个SqlCommand对象而不是数据表：

 public SqlCommand getData(string query, string year, string month) { SqlCommand cmd = new SqlCommand(query, con); cmd.Parameters.AddWithValue("@YR", year); cmd.Parameters.AddWithValue("@MN", month); cmd.CommandType = CommandType.StoredProcedure; cmd.CommandTimeout = 0; return cmd; } 

从这里，你的函数调用和输出到Excel可以看起来像这样：

 SqlCommand cmd = func.getData("sp_MRR_Retention_APAC", Yr, mn); SqlDataReader reader = cmd.ExecuteReader(); for (int col = 0; col < reader.FieldCount; col++) xlWorkSheet.Cells[col + 1, 1].Value2 = reader.GetName(col); while (reader.Read()) { for (int col = 0; col < reader.FieldCount; col++) if (!reader.IsDBNull(col)) xlWorkSheet.Cells[row, col + 1] = reader.GetValue(col); row++; } reader.Close(); 

你甚至可以用一个单独的方法来包装它来做Excelinput：

 public void getData(string query, string year, string month, excel.Worksheet Ws) { SqlCommand cmd = new SqlCommand(query, con); cmd.Parameters.AddWithValue("@YR", year); cmd.Parameters.AddWithValue("@MN", month); cmd.CommandType = CommandType.StoredProcedure; cmd.CommandTimeout = 0; int row = 1; SqlDataReader reader = cmd.ExecuteReader(); for (int col = 0; col < reader.FieldCount; col++) Ws.Cells[col + 1, 1].Value2 = reader.GetName(col); while (reader.Read()) { for (int col = 0; col < reader.FieldCount; col++) if (!reader.IsDBNull(col)) Ws.Cells[row, col + 1] = reader.GetValue(col); row++; } reader.Close(); } 

这将简化主要方法中的所有代码，以便：

 func.getData("sp_MRR_Retention_APAC", Yr, mn, xlWorkSheet); 

下面是真正的踢球者…内置于Excel中的MS Query实际上是为你做的。 通常情况下，你使用的是ODBC，但是使用MS SQL Server，你可以不用ODBC就可以直接访问服务器 – 这是微软与微软之间的同居。 老实说，我从来没有尝试过一个存储过程，但用一个查询，它会出色地工作。 我没有理由怀疑MS Query将以一个程序运行。

C＃中的MS Query调用看起来像这样：

 excel.ListObject lo = sheet.ListObjects.AddEx(excel.XlListObjectSourceType.xlSrcQuery, connectionString, true, Excel.XlYesNoGuess.xlGuess, range); lo.QueryTable.CommandText = queryText; lo.Refresh(); 

而且你会发现它速度非常快 – 我敢说它会和任何你可以用手写的东西相媲美。