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我在使用自动增量 ID 的 Web 服务方法方面遇到问题。我的数据库中有一张表：tableExam

PK - IDExam - int - auto increment
---- ExamName - string
---- ExamGrade - int

然后我创建一个 Web 服务方法：

[WebMethod]
public void addExam(int IDExam, string ExamName, int ExamGrade)
{
    Exam e = new Exam{
    ExamName = ExamName,
    ExamGrade = ExamGrade};
}

然后我将它用于我的表单。当我点击提交按钮时，它运行：

sampleWS s = new sampleWS();
s.addExam(bla, bla, bla);

现在有一个错误告诉我无法设置主键。

System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Data.SqlClient.SqlException: Cannot insert explicit value for identity column in table 'tableExam' when IDENTITY_INSERT is set to OFF.
  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()
  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 System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult)
  at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries)
  at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
  at System.Data.Linq.ChangeDirector.StandardChangeDirector.DynamicInsert(TrackedObject item)
  at System.Data.Linq.ChangeDirector.StandardChangeDirector.Insert(TrackedObject item)
  at System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode)
  at System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode)
  at System.Data.Linq.DataContext.SubmitChanges()

我尝试像这样更改我的网络服务：

[WebMethod]
public void addExam(string ExamName, int ExamGrade)
{
    Exam e = new Exam{
    ExamName = ExamName,
    ExamGrade = ExamGrade};
}

现在它仍然有错误：

ObjectDataSource 'ObjectDataSourceP' 找不到具有以下参数的非泛型方法 'addExam'：IDExam、ExamName、ExamGrade。

那么，我必须怎么做才能使用这个带有自动递增 PK ID 的 WS 方法呢？

4

2 回答 2

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如果我看到你的异常，你能给出你正在使用的 dal 代码然后它告诉 id 有身份并且你给 id 一个错误的值，id 将被自动添加。你不必设置examid 错误在Query not in webmethod

于 2012-04-20T17:52:49.860 回答
0

更改为

sampleWS s = new sampleWS();
s.addExam(100000000, bla, bla);

它有效..

感谢您的参与...

于 2012-04-27T15:49:48.730 回答