如何將XML參數添加到C＃中的存儲過程？

Question

我正在VS 2008中開發一個C＃web應用程序，該應用程序與我的SQL Server 2008中的Adventureworks數據庫進行交互。現在，我正在嘗試向其中包含XML列的其中一個表添加新記錄。我該怎麼做呢？ 這是我得到的錯誤：

System.Data.SqlClient.SqlException was caught 
    Message="XML Validation: Text node is not allowed at this location, the type was defined with element only content or with simple content. Location: /" 
    Source=".Net SqlClient Data Provider" 
    ErrorCode=-2146232060 
    Class=16 
    LineNumber=22 
    Number=6909 
    Procedure="AppendDataC" 
    Server="." 
    State=1 
    StackTrace: 
     at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) 
     at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) 
     at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) 
     at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) 
     at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) 
     at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) 
     at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) 
     at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) 
     at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() 
     at ADONET_namespace.ADONET_methods.AppendDataC(DataRow d, Hashtable ht) in C:\Documents and Settings\Admin\My Documents\Visual Studio 2008\Projects\AddFileToSQL\AddFileToSQL\ADONET methods.cs:line 212 
    InnerException: 

而且這是在C＃中的我的代碼部分：

try 
      { 
       SqlConnection conn2 = new SqlConnection(connString); 
       SqlCommand cmd = conn2.CreateCommand(); 
       cmd.CommandText = "dbo.AppendDataC"; 
       cmd.CommandType = CommandType.StoredProcedure; 
       cmd.Connection = conn2; 
... 
       sqlParam10.SqlDbType = SqlDbType.VarChar; 
       SqlParameter sqlParam11 = cmd.Parameters.AddWithValue("@" + ht["@col11"], d[10]); 
       sqlParam11.SqlDbType = SqlDbType.VarChar; 
       SqlParameter sqlParam12 = cmd.Parameters.AddWithValue("@" + ht["@col12"], d[11]); 
       sqlParam12.SqlDbType = SqlDbType.Xml; 
... 
       conn2.Open(); 
       cmd.ExecuteNonQuery(); //This is the line it fails on and then jumps 
             //to the Catch statement 
       conn2.Close(); 
       errorMsg = "The Person.Contact table was successfully updated!"; 
      } 
      catch (Exception ex) 
      { 

現在在我的文字輸入MDF文件我有XML參數：

'<Products><id>3</id><id>6</id><id>15</id></Products>' 

這是XML的有效格式嗎？

Answer 1

如果指定SqlDbType.Xml，參數的值必須是SqlXml類的一個實例：

sqlParam12.Value = new SqlXml(...); 

如果你想設置一個XML字符串轉換爲XML列（沒有實例SqlXml），你可以將參數的類型設置爲SqlDbType.VarChar - 當您調用AddWithValue時，實際上不需要該參數 - 並且它將被隱式轉換，假設XML格式良好（您的是）。