小编San*_*mar的帖子

我正在处理一个项目并收到错误,因为"没有为命令对象设置命令文本".我的代码是:

query = "select Top 10    
                 Name,
                 R_Line2,
                 BirthDate,
                 BirthTime,
                 Height,
                 Weight,
                 BirthCity,
                 BirthCountry,
                 FatherName,
                 MonthlyIncome,
                 FamilyIncome,
                 Add1,
                 Add2,
                 PinCode,
                 Tel1,
                 Tel2
          from InpRegistration  
          where DateDiff('yyyy', [Birthdate],
                  Now()) BETWEEN @AgeFrom AND
                  @AgeTo and Weight BETWEEN @MinWeight AND 
                  @MaxWeight and Height BETWEEN @MinHeight AND @MaxHeight and   
                  MonthlyIncome BETWEEN @MinIncome AND @MaxIncome";

connf.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data   Source=D:\project\Milan_Data.mdb";

connf.Open();

   OleDbCommand cmdf = new OleDbCommand(query, connf);

    cmdf.CommandType = CommandType.Text;

        cmdf.Parameters.AddWithValue("@AgeFrom", ddlminage.SelectedItem.Text);
        cmdf.Parameters.AddWithValue("@AgeTo", ddlmaxage.SelectedItem.Text);
        cmdf.Parameters.AddWithValue("@MinWeight", ddlweightmin.SelectedValue);
        cmdf.Parameters.AddWithValue("@MaxWeight", ddlweightmax.SelectedValue);
        cmdf.Parameters.AddWithValue("@MinHeight", ddlheightmin.SelectedValue);
        cmdf.Parameters.AddWithValue("@MaxHeight", ddlheightmax.SelectedValue);
        cmdf.Parameters.AddWithValue("@MinIncome", ddlminincome.SelectedItem.Text);
        cmdf.Parameters.AddWithValue("@MinIncome", ddlmaxincome.SelectedItem.Text); …