C# 如何将特定值从数据库加载到dropdownlist？

我有一个返回数据的查询。实际上，它只需要返回一行数据，但我必须从不同的表中获取多条记录，它们包含一个主属性的多个值。根据查询，我得到了几行。现在，我想将列的一个单元格中的一个记录加载到dropdownlist。我怎么做？ 这是我的问题

select emp.[App_no] 
    ,emp.[EMP_CALLING_NAME]
    ,emp.[EMP_INI]
    ,emp.[EMP_SURNAME]
    ,emp.[EMP_TITLE]
    ,emp.[EMP_NAMES_INI]
    ,emp.[EMP_FULLNAME]
    ,emp.[EMP_NIC]
    ,emp.[EMP_dob]
    ,emp.[EMP_GENDER]
    ,emp.[NAT_CODE]
    ,emp.[EMP_MARITAL_STATUS] 
    ,emp.[EMP_DATE_JOINED]
    ,emp.[EMP_CONFIRM]
    ,emp.[CX_CODE]
    ,emp.[DSMG_CODE]
    ,emp.[CAQT_CODE]
    ,emp.[EMP_PER_ADDRESS1]
    ,emp.[EMP_PER_ADDRESS2]
    ,emp.[EMP_PER_ADDRESS3]
    ,emp.[EMP_PER_CITY]
    ,emp.[EMP_PER_TELEPHONE]
    ,emp.[EMP_PER_MOBILE]
    ,emp.[EMP_PER_PROVINCE]
    ,emp.[EMP_PER_DISTRICT]
    ,emp.[EMP_TEM_ADDRESS1]
    ,emp.[EMP_TEM_ADDRESS2]
    ,emp.[EMP_PER_ELECTORATE]
    ,emp.[EMP_TEM_ADDRESS3]
    ,emp.[EMP_TEM_CITY]
    ,emp.[EMP_PER_GD]
    ,bank.[BBRANCH_CODE]
    ,bank.[EBANK_ACC_NO]
    ,bank.[EBANK_ACC_TYPE_FLG]
    ,bank.[EBANK_ACTIVE_FLAG]
    ,bank.[LAST_MODIFIED_DATE]
    ,qual.[Qulif_code]
    ,lang.[lang_code]
    ,lang.[ability_type]
    ,ex.[From_date]
    ,ex.[To_date]
    ,ex.[Organization]
    ,ex.[designation]
    ,ex.[Cobtact_No]
    ,nation.[NAT_NAME]
    from [EMPLOYEE] emp, [EMP_BANK] bank,
    [QUALIF] qual, [LANG] lang,
    [Experience] ex, [NATIONALITY] nation
    where emp.App_no = bank.App_no and emp.App_no = qual.App_No 
    and emp.App_no = lang.App_no and nation.NAT_CODE = emp.[NAT_CODE]
    and emp.App_no = ex.App_no and emp.App_no=@num           

这就是我绑定数据的方式

select emp.[App_no] 
    ,emp.[EMP_CALLING_NAME]
    ,emp.[EMP_INI]
    ,emp.[EMP_SURNAME]
    ,emp.[EMP_TITLE]
    ,emp.[EMP_NAMES_INI]
    ,emp.[EMP_FULLNAME]
    ,emp.[EMP_NIC]
    ,emp.[EMP_dob]
    ,emp.[EMP_GENDER]
    ,emp.[NAT_CODE]
    ,emp.[EMP_MARITAL_STATUS] 
    ,emp.[EMP_DATE_JOINED]
    ,emp.[EMP_CONFIRM]
    ,emp.[CX_CODE]
    ,emp.[DSMG_CODE]
    ,emp.[CAQT_CODE]
    ,emp.[EMP_PER_ADDRESS1]
    ,emp.[EMP_PER_ADDRESS2]
    ,emp.[EMP_PER_ADDRESS3]
    ,emp.[EMP_PER_CITY]
    ,emp.[EMP_PER_TELEPHONE]
    ,emp.[EMP_PER_MOBILE]
    ,emp.[EMP_PER_PROVINCE]
    ,emp.[EMP_PER_DISTRICT]
    ,emp.[EMP_TEM_ADDRESS1]
    ,emp.[EMP_TEM_ADDRESS2]
    ,emp.[EMP_PER_ELECTORATE]
    ,emp.[EMP_TEM_ADDRESS3]
    ,emp.[EMP_TEM_CITY]
    ,emp.[EMP_PER_GD]
    ,bank.[BBRANCH_CODE]
    ,bank.[EBANK_ACC_NO]
    ,bank.[EBANK_ACC_TYPE_FLG]
    ,bank.[EBANK_ACTIVE_FLAG]
    ,bank.[LAST_MODIFIED_DATE]
    ,qual.[Qulif_code]
    ,lang.[lang_code]
    ,lang.[ability_type]
    ,ex.[From_date]
    ,ex.[To_date]
    ,ex.[Organization]
    ,ex.[designation]
    ,ex.[Cobtact_No]
    ,nation.[NAT_NAME]
    from [EMPLOYEE] emp, [EMP_BANK] bank,
    [QUALIF] qual, [LANG] lang,
    [Experience] ex, [NATIONALITY] nation
    where emp.App_no = bank.App_no and emp.App_no = qual.App_No 
    and emp.App_no = lang.App_no and nation.NAT_CODE = emp.[NAT_CODE]
    and emp.App_no = ex.App_no and emp.App_no=@num           

ddlDesignations.DataSource = ds.Tables[0];
ddlDesignations.DataTextField = "designation";
ddlDesignations.DataValueField = "designation";
ddlDesignations.DataBind();              

这是dropdownlist的显示方式

---

这可能会奏效

select emp.[App_no] 
    ,emp.[EMP_CALLING_NAME]
    ,emp.[EMP_INI]
    ,emp.[EMP_SURNAME]
    ,emp.[EMP_TITLE]
    ,emp.[EMP_NAMES_INI]
    ,emp.[EMP_FULLNAME]
    ,emp.[EMP_NIC]
    ,emp.[EMP_dob]
    ,emp.[EMP_GENDER]
    ,emp.[NAT_CODE]
    ,emp.[EMP_MARITAL_STATUS] 
    ,emp.[EMP_DATE_JOINED]
    ,emp.[EMP_CONFIRM]
    ,emp.[CX_CODE]
    ,emp.[DSMG_CODE]
    ,emp.[CAQT_CODE]
    ,emp.[EMP_PER_ADDRESS1]
    ,emp.[EMP_PER_ADDRESS2]
    ,emp.[EMP_PER_ADDRESS3]
    ,emp.[EMP_PER_CITY]
    ,emp.[EMP_PER_TELEPHONE]
    ,emp.[EMP_PER_MOBILE]
    ,emp.[EMP_PER_PROVINCE]
    ,emp.[EMP_PER_DISTRICT]
    ,emp.[EMP_TEM_ADDRESS1]
    ,emp.[EMP_TEM_ADDRESS2]
    ,emp.[EMP_PER_ELECTORATE]
    ,emp.[EMP_TEM_ADDRESS3]
    ,emp.[EMP_TEM_CITY]
    ,emp.[EMP_PER_GD]
    ,bank.[BBRANCH_CODE]
    ,bank.[EBANK_ACC_NO]
    ,bank.[EBANK_ACC_TYPE_FLG]
    ,bank.[EBANK_ACTIVE_FLAG]
    ,bank.[LAST_MODIFIED_DATE]
    ,qual.[Qulif_code]
    ,lang.[lang_code]
    ,lang.[ability_type]
    ,ex.[From_date]
    ,ex.[To_date]
    ,ex.[Organization]
    ,ex.[designation]
    ,ex.[Cobtact_No]
    ,nation.[NAT_NAME]
    from [EMPLOYEE] emp, [EMP_BANK] bank,
    [QUALIF] qual, [LANG] lang,
    [Experience] ex, [NATIONALITY] nation
    where emp.App_no = bank.App_no and emp.App_no = qual.App_No 
    and emp.App_no = lang.App_no and nation.NAT_CODE = emp.[NAT_CODE]
    and emp.App_no = ex.App_no and emp.App_no=@num           

DataView view = new DataView(ds.Tables[0]);
DataTable distinctValues = view.ToTable(true, "designation");
ddlDesignations.DataSource = distinctValues;
ddlDesignations.DataTextField = "designation";
ddlDesignations.DataValueField = "designation";
ddlDesignations.DataBind();

这里，ToTable中的第一个参数是一个布尔值，它指示您是否需要不同的行。ToTable中的第二个参数是列名，我们必须根据它选择不同的行。只有这些列将在返回的数据表中。

您可以使用LINQ进行此操作

select emp.[App_no] 
    ,emp.[EMP_CALLING_NAME]
    ,emp.[EMP_INI]
    ,emp.[EMP_SURNAME]
    ,emp.[EMP_TITLE]
    ,emp.[EMP_NAMES_INI]
    ,emp.[EMP_FULLNAME]
    ,emp.[EMP_NIC]
    ,emp.[EMP_dob]
    ,emp.[EMP_GENDER]
    ,emp.[NAT_CODE]
    ,emp.[EMP_MARITAL_STATUS] 
    ,emp.[EMP_DATE_JOINED]
    ,emp.[EMP_CONFIRM]
    ,emp.[CX_CODE]
    ,emp.[DSMG_CODE]
    ,emp.[CAQT_CODE]
    ,emp.[EMP_PER_ADDRESS1]
    ,emp.[EMP_PER_ADDRESS2]
    ,emp.[EMP_PER_ADDRESS3]
    ,emp.[EMP_PER_CITY]
    ,emp.[EMP_PER_TELEPHONE]
    ,emp.[EMP_PER_MOBILE]
    ,emp.[EMP_PER_PROVINCE]
    ,emp.[EMP_PER_DISTRICT]
    ,emp.[EMP_TEM_ADDRESS1]
    ,emp.[EMP_TEM_ADDRESS2]
    ,emp.[EMP_PER_ELECTORATE]
    ,emp.[EMP_TEM_ADDRESS3]
    ,emp.[EMP_TEM_CITY]
    ,emp.[EMP_PER_GD]
    ,bank.[BBRANCH_CODE]
    ,bank.[EBANK_ACC_NO]
    ,bank.[EBANK_ACC_TYPE_FLG]
    ,bank.[EBANK_ACTIVE_FLAG]
    ,bank.[LAST_MODIFIED_DATE]
    ,qual.[Qulif_code]
    ,lang.[lang_code]
    ,lang.[ability_type]
    ,ex.[From_date]
    ,ex.[To_date]
    ,ex.[Organization]
    ,ex.[designation]
    ,ex.[Cobtact_No]
    ,nation.[NAT_NAME]
    from [EMPLOYEE] emp, [EMP_BANK] bank,
    [QUALIF] qual, [LANG] lang,
    [Experience] ex, [NATIONALITY] nation
    where emp.App_no = bank.App_no and emp.App_no = qual.App_No 
    and emp.App_no = lang.App_no and nation.NAT_CODE = emp.[NAT_CODE]
    and emp.App_no = ex.App_no and emp.App_no=@num           

---

您想在下拉列表中显示哪一列？@Ahmar[designation]column我想避免在下拉列表中重复相同的记录如果您只需要在UI中显示指定，那么为什么要获取这么多不相关的值？与答案无关，一个一般性建议-停止使用垃圾值进行测试，您可能会感到困惑。下拉列表上只显示[designation]列，然后从数据库端更改查询仅返回[designation]列。这很有效。谢谢你的回答。我会接受的，谢谢你的帮助。快乐编码：@Mohit我试图对界面中的其他几个dropdownlists使用相同的代码，但只有第一个有效。“你知道这是为什么吗？”莫希特说，“我犯了一个小错误，我可以找出原因。”。