Question

我在执行代码时遇到错误，CommandText属性尚未初始化

  public DataTable Mappingdataload(string name)
        {
            try
            {
                string spname = "";
                switch (name.ToLower())
                {
                    case "student":
                        spname = "RetrieveStudent";
                        break;
                    case "organization":
                        spname = "RetrieveOrganization";
                        break;
                }
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = SQLConClass.GetSQLConnection();
                cmd.CommandText = spname;
                cmd.CommandType = System.Data.CommandType.StoredProcedure;
                SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd);
                DataTable dataTable = new DataTable();
                sqlDataAdapter.Fill(dataTable);
                return dataTable;
            }
            catch (Exception)
            {
                throw;
            }
        }

Answer 1

由于未初始化命令文本而收到此错误：）

总是最好先建立连接，然后再创建命令。检查下面的代码。

var conn = SQLConClass.GetSQLConnection();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = spname;
cmd.CommandType = CommandType.StoredProcedure;

最好像这样使用它：

using (var conn = SQLConClass.GetSQLConnection())
using (SqlCommand cmd = conn.CreateCommand())
{ 
     cmd.CommandText = spname;
     cmd.CommandType = CommandType.StoredProcedure;
     using (var reader = cmd.ExecuteReader())
     { 
          ....
     }
}

CommandText属性尚未初始化，错误

1 个答案: