让SqlDataAdapter和SqlCommand混淆

我有这个调用方法：

public string RunReportSteps(int _reportKey) { DataTable fStepsTable; fStepsTable = GetStepsTable("xxx.console.pr_xxx"); return (string)fStepsTable.Rows[1][3]; } 

它调用这个私有方法：

 private DataTable GetStepsTable(string procName) { var connectionString = ConfigurationManager.ConnectionStrings["xxx"].ConnectionString; using(var conn = new SqlConnection(connectionString)) using(var adapt = new SqlDataAdapter()) using(var cmd = new SqlCommand(procName, conn)) { conn.Open(); SqlParameter p = new SqlParameter("@ReportKey", this.ReportKey); p.Direction = ParameterDirection.Input; cmd.Parameters.Add(p); adapt.SelectCommand = cmd; DataSet mySet = new DataSet(); adapt.Fill(mySet); //<<<<<<<<<<<<<<<<<<<errors here return mySet.Tables[0]; } } 

为什么我收到以下错误消息？

过程或函数’pr_xxx’需要参数’@ReportKey’，这是未提供的。

Answer 1

我假设procName是存储过程的名称。 您尚未将SqlCommand的CommandType设置为StoredProcedure ：

 using(var conn = new SqlConnection(connectionString)) using(var cmd = new SqlCommand(procName, conn)) using(var adapt = new SqlDataAdapter(cmd)) { cmd.CommandType = CommandType.StoredProcedure; // <<< this was missing SqlParameter p = new SqlParameter("@ReportKey", this.ReportKey); p.Direction = ParameterDirection.Input; cmd.Parameters.Add(p); DataTable table = new DataTable(); adapt.Fill(table); return table; }