我遇到了两个相互关联的下拉列表的问题。 dlJobName是系统中当前作业的列表。 dlStage是基于所选dlJobName值的可用阶段列表。我两个都有autopostback = True。第三个下拉列表包含值列表。 gridview使用这三个选项来产生结果。我在使用dlStage下拉列表时遇到问题。我收到一个错误： 'dlStage'有一个SelectedValue，它是无效的，因为它在项目列表中不存在。 参数名称：值
我遇到的问题是编写此代码以防止此错误的最佳方法是什么。似乎正在发生的事情是我试图保留变量中选择的最后一个值，这导致了我的问题。这是代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Web.Security;
using System.Configuration;
namespace AnnoTracker
{
public partial class WebForm1 : System.Web.UI.Page
{
public static class MyVariables
{
public static int PI = 0;
public static string JN = "";
public static string ST = "";
public static string AT = "";
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (MyVariables.AT == "")
{
dlAnnoType.SelectedValue = "Agency Error";
dlAnnoType.DataBind();
}
if (MyVariables.AT != "")
{
dlAnnoType.SelectedValue = MyVariables.AT;
dlAnnoType.DataBind();
}
if (MyVariables.JN == "")
{
dlJobName.SelectedIndex = 0;
dlJobName.DataBind();
}
if (MyVariables.JN != "")
{
dlJobName.SelectedValue = MyVariables.JN;
dlJobName.DataBind();
}
if (MyVariables.ST == "")
{
dlStage.SelectedIndex = 0;
dlStage.DataBind();
}
if (MyVariables.JN != "")
{
dlStage.SelectedValue = MyVariables.ST;
dlStage.DataBind();
}
dlStage.SelectedIndex = 0;
dlStage.DataBind();
BindData();
if (MyVariables.PI == 0)
{
gvSummary.PageIndex = 0;
gvSummary.DataBind();
}
if (MyVariables.PI != 0)
{
gvSummary.PageIndex = MyVariables.PI;
gvSummary.DataBind();
}
}
}
protected void EditSummary(object sender, GridViewEditEventArgs e)
{
gvSummary.EditIndex = e.NewEditIndex;
string _custName = gvSummary.DataKeys[e.NewEditIndex].Value.ToString();
BindData();
}
protected void CancelEdit(object sender, GridViewCancelEditEventArgs e)
{
gvSummary.EditIndex = -1;
BindData();
}
protected void gvSummary_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
gvSummary.PageIndex = e.NewPageIndex;
MyVariables.PI = e.NewPageIndex;
BindData();
}
protected void RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow && gvSummary.EditIndex == e.Row.RowIndex)
{
DropDownList dlBU = (DropDownList)e.Row.FindControl("dlBU");
string _custName = gvSummary.DataKeys[e.Row.RowIndex].Values[1].ToString();
string BUquery = "select distinct Unit from vw_BU where Business='" + _custName + "'";
SqlCommand BUcmd = new SqlCommand(BUquery);
dlBU.DataSource = GetData(BUcmd);
dlBU.DataTextField = "Unit";
dlBU.DataValueField = "Unit";
dlBU.DataBind();
dlBU.Items.FindByValue((e.Row.FindControl("lblBU") as Label).Text).Selected = true;
DropDownList dlPA = (DropDownList)e.Row.FindControl("dlPA");
string _PAcustName = gvSummary.DataKeys[e.Row.RowIndex].Values[1].ToString();
string PAquery = "select PA from PA where Business='" + _PAcustName + "' order by PA";
SqlCommand PAcmd = new SqlCommand(PAquery);
dlPA.DataSource = GetData(PAcmd);
dlPA.DataTextField = "PA";
dlPA.DataValueField = "PA";
dlPA.DataBind();
dlPA.Items.FindByValue((e.Row.FindControl("lblPA") as Label).Text).Selected = true;
DropDownList dlET = (DropDownList)e.Row.FindControl("dlET");
string ETquery = "select distinct ErrorType from ErrorType order by ErrorType";
SqlCommand ETcmd = new SqlCommand(ETquery);
dlET.DataSource = GetData(ETcmd);
dlET.DataTextField = "ErrorType";
dlET.DataValueField = "ErrorType";
dlET.DataBind();
dlET.Items.FindByValue((e.Row.FindControl("lblET") as Label).Text).Selected = true;
DropDownList dlAA = (DropDownList)e.Row.FindControl("dlAA");
string AAquery = "select distinct AAA from ActualAgencyError";
SqlCommand AAcmd = new SqlCommand(AAquery);
dlAA.DataSource = GetData(AAcmd);
dlAA.DataTextField = "AAA";
dlAA.DataValueField = "AAA";
dlAA.DataBind();
dlAA.Items.FindByValue((e.Row.FindControl("lblAA") as Label).Text).Selected = true;
DropDownList dlSupport = (DropDownList)e.Row.FindControl("dlSupport");
string SupQuery = "select distinct Support from Support";
SqlCommand Supcmd = new SqlCommand(SupQuery);
dlSupport.DataSource = GetData(Supcmd);
dlSupport.DataTextField = "Support";
dlSupport.DataValueField = "Support";
dlSupport.DataBind();
dlSupport.Items.FindByValue((e.Row.FindControl("lblSupport") as Label).Text).Selected = true;
}
}
protected void UpdateSummary(object sender, GridViewUpdateEventArgs e)
{
MyVariables.AT = dlAnnoType.SelectedValue;
//dlAnnoType.DataBind();
MyVariables.JN = dlJobName.SelectedValue;
//dlJobName.DataBind();
MyVariables.ST = dlStage.SelectedValue;
//dlStage.DataBind();
MyVariables.PI = gvSummary.PageIndex;
//gvSummary.DataBind();
string BU = (gvSummary.Rows[e.RowIndex].FindControl("dlBU") as DropDownList).SelectedItem.Value;
string ET = (gvSummary.Rows[e.RowIndex].FindControl("dlET") as DropDownList).SelectedItem.Value;
string AA = (gvSummary.Rows[e.RowIndex].FindControl("dlAA") as DropDownList).SelectedItem.Value;
string PA = (gvSummary.Rows[e.RowIndex].FindControl("dlPA") as DropDownList).SelectedValue;
string AnnotationNumber = gvSummary.DataKeys[e.RowIndex].Value.ToString();
string sgkComments = (gvSummary.Rows[e.RowIndex].FindControl("tbsgkComm") as TextBox).Text;
string Support = (gvSummary.Rows[e.RowIndex].FindControl("dlSupport") as DropDownList).SelectedValue;
string SupportName = (gvSummary.Rows[e.RowIndex].FindControl("tbSupportName") as TextBox).Text;
string BusImpact = (gvSummary.Rows[e.RowIndex].FindControl("tbBusImpact") as TextBox).Text;
string strConnString = ConfigurationManager.ConnectionStrings["SRM_MetricConnectionString"].ConnectionString;
using (SqlConnection con = new SqlConnection(strConnString))
{
string query = "update vw_GridviewSource set [BusinessUnit] = @BU, [ErrorType] = @ET, [sgkComments] = @sgk, [ActualAgencyError] = @AA, [PA] = @PA, [Support] = @Support, [SupportName] = @SupportName, [BusImpact] = @BusImpact where [AnnotationNumber] = @AnnoNum";
using (SqlCommand cmd = new SqlCommand(query))
{
cmd.Connection = con;
cmd.Parameters.AddWithValue("@BU", BU);
cmd.Parameters.AddWithValue("@AnnoNum", AnnotationNumber);
cmd.Parameters.AddWithValue("@ET", ET);
cmd.Parameters.AddWithValue("@AA", AA);
cmd.Parameters.AddWithValue("@sgk", sgkComments);
cmd.Parameters.AddWithValue("@PA", PA);
cmd.Parameters.AddWithValue("@Support", Support);
cmd.Parameters.AddWithValue("@SupportName", SupportName);
cmd.Parameters.AddWithValue("@BusImpact", BusImpact);
con.Open();
cmd.ExecuteNonQuery();
con.Close();
Response.Redirect(Request.Url.AbsoluteUri);
}
}
gvSummary.PageIndex = MyVariables.PI;
gvSummary.DataBind();
BindData();
}
private void BindData()
{
gvSummary.PageIndex = MyVariables.PI;
gvSummary.DataBind();
if (MyVariables.JN != "" && MyVariables.ST != "" && MyVariables.AT != "")
{
dlJobName.SelectedValue = MyVariables.JN;
dlJobName.DataBind();
dlStage.SelectedValue = MyVariables.ST;
dlStage.DataBind();
dlAnnoType.SelectedValue = MyVariables.AT;
dlAnnoType.DataBind();
}
gvSummary.PageIndex = MyVariables.PI;
gvSummary.DataBind();
String conString = System.Configuration.ConfigurationManager.ConnectionStrings["SRM_MetricConnectionString"].ConnectionString;
string query = "select [Page_ID],[AnnotationNumber],[AnnotationBy],[PA],[AnnotationType],[BusinessUnit] as Unit,[ErrorType],[ActualAgencyError],AnnotationComments,[sgkComments],[ActualAgencyError],Support,SupportName, BusImpact,Cust from vw_GridviewSource order by [Page_ID]";
SqlCommand cmd = new SqlCommand();
if (dlJobName.SelectedValue != "" & dlStage.SelectedValue != "")
{
query = "select [Page_ID],[AnnotationNumber],[AnnotationBy],[PA],[AnnotationType],[BusinessUnit] as Unit,[ErrorType],[ActualAgencyError],AnnotationComments,[sgkComments],[ActualAgencyError],Support,SupportName, BusImpact,Cust from vw_GridviewSource where Name = '" + dlJobName.SelectedValue + "' and AnnotationDate = '" + dlStage.SelectedValue + "' order by [Page_ID]";
//cmd.Parameters.AddWithValue("@Name", dlJobName.SelectedValue);
//cmd.Parameters.AddWithValue("@Stage", dlStage.SelectedValue);
}
if (dlAnnoType.SelectedValue != "" && (dlJobName.SelectedValue.Length < 2 && dlStage.SelectedValue.Length < 2))
{
query = "select [Page_ID],[AnnotationNumber],[AnnotationBy],[PA],[AnnotationType],[BusinessUnit] as Unit,[ErrorType],[ActualAgencyError],AnnotationComments,[sgkComments],[ActualAgencyError],Support,SupportName, BusImpact,Cust from vw_GridviewSource where AnnotationType = '" + dlAnnoType.SelectedValue + "' order by [Page_ID]";
}
if (dlAnnoType.SelectedValue != "" && (dlJobName.SelectedValue != "" && dlStage.SelectedValue != ""))
{
query = "select [Page_ID],[AnnotationNumber],[AnnotationBy],[PA],[AnnotationType],[BusinessUnit] as Unit,[ErrorType],[ActualAgencyError],AnnotationComments,[sgkComments],[ActualAgencyError],Support,SupportName, BusImpact,Cust from vw_GridviewSource where AnnotationType = '" + dlAnnoType.SelectedValue + "' and Name = '" + dlJobName.SelectedValue + "' and AnnotationDate = '" + dlStage.SelectedValue + "' order by [Page_ID]";
}
cmd.CommandText = query;
SqlConnection con = new SqlConnection(conString);
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
SqlDataAdapter sda = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
sda.Fill(ds);
gvSummary.DataSource = ds;
gvSummary.PageIndex = MyVariables.PI;
gvSummary.DataBind();
}
private DataTable GetData(SqlCommand cmd)
{
string strConnString = ConfigurationManager.ConnectionStrings["SRM_MetricConnectionString"].ConnectionString;
using (SqlConnection con = new SqlConnection(strConnString))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.Connection = con;
sda.SelectCommand = cmd;
using (DataTable dt = new DataTable())
{
sda.Fill(dt);
return dt;
}
}
}
}
protected void dlJobName_SelectedIndexChanged(object sender, EventArgs e)
{
MyVariables.JN = dlJobName.SelectedValue;
dlJobName.DataBind();
MyVariables.ST = dlStage.SelectedValue;
dlStage.DataBind();
MyVariables.AT = dlAnnoType.SelectedValue;
dlAnnoType.DataBind();
BindData();
MyVariables.PI = gvSummary.PageIndex;
gvSummary.DataBind();
}
protected void dlStage_SelectedIndexChanged(object sender, EventArgs e)
{
MyVariables.JN = dlJobName.SelectedValue;
//dlStage.DataBind();
MyVariables.ST = dlStage.SelectedValue;
MyVariables.AT = dlAnnoType.SelectedValue;
gvSummary.DataBind();
BindData();
}
protected void dlAnnoType_SelectedIndexChanged(object sender, EventArgs e)
{
MyVariables.AT = dlAnnoType.SelectedValue;
MyVariables.JN = dlJobName.SelectedValue;
//dlStage.DataBind();
MyVariables.ST = dlStage.SelectedValue;
gvSummary.DataBind();
BindData();
}
}
}
答案 0 :(得分：0)
我在你的page_load事件代码中发现了两个问题，我在这里进行了修改：
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (MyVariables.AT == "")
{
dlAnnoType.DataBind();
dlAnnoType.SelectedValue = "Agency Error";
}
if (MyVariables.AT != "")
{
dlAnnoType.DataBind();
dlAnnoType.SelectedValue = MyVariables.AT;
}
if (MyVariables.JN == "")
{
dlJobName.DataBind();
dlJobName.SelectedIndex = 0;
}
if (MyVariables.JN != "")
{
dlJobName.DataBind();
dlJobName.SelectedValue = MyVariables.JN;
}
if (MyVariables.ST == "")
{
dlStage.DataBind();
dlStage.SelectedIndex = 0;
}
dlStage.DataBind();
//dlStage.SelectedIndex = 0;
if (MyVariables.ST != "")
{
//dlStage.DataBind();
dlStage.SelectedValue = MyVariables.ST;
}
BindData();
if (MyVariables.PI == 0)
{
gvSummary.DataBind();
gvSummary.PageIndex = 0;
}
if (MyVariables.PI != 0)
{
gvSummary.DataBind();
gvSummary.PageIndex = MyVariables.PI;
}
}
}