我有一个带有模板字段的 GridView ，其中包含下拉列表和文本框。 1 下拉列表将是所谓的“主”下拉列表，当所选索引更改时，同一行中的其他下拉列表将使用主下拉列表的所选值进行数据绑定(bind)。
我的 ASPX 有此代码
<asp:GridView ID="gvEducations" runat="server" AutoGenerateColumns="false"
DataKeyNames="file2_id" onrowcancelingedit="gvEducations_RowCancelingEdit"
onrowdatabound="gvEducations_RowDataBound"
onrowdeleting="gvEducations_RowDeleting" onrowediting="gvEducations_RowEditing"
onrowupdating="gvEducations_RowUpdating">
<Columns>
<asp:BoundField HeaderText="file2_id" DataField="file2_id" ReadOnly="true" Visible="False"/>
<asp:TemplateField HeaderText="Education Establishment">
<ItemTemplate>
<%# Eval("education_establishment_code") %>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlEditEducationEstablishment" runat="server"
OnSelectedIndexChanged="ddlEditEducationEstablishment_SelectedIndexChanged">
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="School">
<ItemTemplate>
<%# Eval("school_code") %>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlEditSchool" runat="server"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="School Others" Visible="false">
<ItemTemplate>
<%# Eval("school_others") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEditSchoolOthers" runat="server" MaxLength="81"
Text='<%# Eval("school_others") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Start Date">
<ItemTemplate>
<%# Convert.ToDateTime(Eval("start_date")).ToString("d")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEditStartDate" runat="server" type="date"
Text='<%# Bind("start_date", "{0:yyyy-MM-dd}") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="End Date">
<ItemTemplate>
<%# Convert.ToDateTime(Eval("end_date")).ToString("d")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEditEndDate" runat="server" type="date"
Text='<%# Bind("end_date", "{0:yyyy-MM-dd}") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Branch Of Study 1">
<ItemTemplate>
<%# Eval("branch_of_study_1_code") %>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlEditBranchOfStudy1" runat="server"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Certificate">
<ItemTemplate>
<%# Eval("certificate_code") %>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlEditCertificate" runat="server"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Course Appraisal">
<ItemTemplate>
<%# Eval("course_appraisal") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEditCourseAppraisal" runat="server" MaxLength="30"
Text='<%# Eval("course_appraisal") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Branch Of Study 2">
<ItemTemplate>
<%# Eval("branch_of_study_2_code") %>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlEditBranchOfStudy2" runat="server"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Edit">
<ItemTemplate>
<asp:Button ID="btnEdit" runat="server" Text="Edit" CommandName="Edit" UseSubmitBehavior="false"/>
</ItemTemplate>
<EditItemTemplate>
<asp:Button ID="btnSave" runat="server" Text="Save" CommandName="Update" UseSubmitBehavior="false"/>
<asp:Button ID="btnCanel" runat="server" Text="Cancel" CommandName="Cancel" UseSubmitBehavior="false"/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:Button ID="btnDelete" runat="server" Text="Delete" CommandName="Delete" UseSubmitBehavior="false"/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
隐藏代码(RowDataBound Gridview 事件)
protected void gvEducations_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow && gvEducations.EditIndex == e.Row.RowIndex)
{
int file2Id = int.Parse(gvEducations.DataKeys[e.Row.RowIndex].Value.ToString());
DataTable dt = new DataTable();
dt = file2BLO.SelectSpecificFile2(file2Id);
DropDownList ddlEditEducationEstablishment =
(DropDownList)e.Row.FindControl("ddlEditEducationEstablishment");
ddlEditEducationEstablishment.DataSource =
educationEstablishmentBLO.SelectAllEducationEstablishment();
ddlEditEducationEstablishment.DataValueField = "education_establishment_code";
ddlEditEducationEstablishment.DataTextField = "education_establishment";
ddlEditEducationEstablishment.DataBind();
ddlEditEducationEstablishment.SelectedValue =
dt.Rows[0]["education_establishment_code"].ToString();
string educationEstablishmentCode = ddlEditEducationEstablishment.SelectedValue;
DropDownList ddlEditSchool = (DropDownList)e.Row.FindControl("ddlEditSchool");
ddlEditSchool.DataSource =
schoolBLO.SelectSchoolOfEstablishment(educationEstablishmentCode);
ddlEditSchool.DataValueField = "school_code";
ddlEditSchool.DataTextField = "school";
ddlEditSchool.DataBind();
ddlEditSchool.SelectedValue = dt.Rows[0]["school_code"].ToString();
DropDownList ddlEditBranchOfStudy1 = (DropDownList)e.Row.FindControl
("ddlEditBranchOfStudy1");
ddlEditBranchOfStudy1.DataSource = branchOfStudyBLO.
SelectBranchOfEstablishment(educationEstablishmentCode);
ddlEditBranchOfStudy1.DataValueField = "branch_of_study_code";
ddlEditBranchOfStudy1.DataTextField = "branch_of_study";
ddlEditBranchOfStudy1.DataBind();
ddlEditBranchOfStudy1.SelectedValue = dt.Rows[0]["branch_of_study_1_code"].ToString();
DropDownList ddlEditCertificate = (DropDownList)e.Row.FindControl
("ddlEditCertificate");
ddlEditCertificate.DataSource = certificateBLO.
SelectCertificateOfEstablishment(educationEstablishmentCode);
ddlEditCertificate.DataValueField = "certificate_code";
ddlEditCertificate.DataTextField = "certificate";
ddlEditCertificate.DataBind();
ddlEditCertificate.SelectedValue = dt.Rows[0]["certificate_code"].ToString();
DropDownList ddlEditBranchOfStudy2 = (DropDownList)e.Row.
FindControl("ddlEditBranchOfStudy2");
ddlEditBranchOfStudy2.DataSource = branchOfStudyBLO.
SelectBranchOfEstablishment(educationEstablishmentCode);
ddlEditBranchOfStudy2.DataValueField = "branch_of_study_code";
ddlEditBranchOfStudy2.DataTextField = "branch_of_study";
ddlEditBranchOfStudy2.DataBind();
ddlEditBranchOfStudy2.SelectedValue = dt.Rows[0]["branch_of_study_1_code"].ToString();
}
}
这是我尝试过的:
protected void ddlEditEducationEstablishment_SelectedIndexChanged(object sender, EventArgs e)
{
//if (e.Row.RowType == DataControlRowType.DataRow && gvEducations.EditIndex == e.Row.RowIndex)
//{
// DropDownList ddlEditEducationEstablishment =
// (DropDownList)e.Row.FindControl("ddlEditEducationEstablishment");
// string educationEstablishmentCode = ddlEditEducationEstablishment.SelectedValue;
// DropDownList ddlEditSchool = (DropDownList)e.Row.FindControl("ddlEditSchool");
// ddlEditSchool.DataSource =
// schoolBLO.SelectSchoolOfEstablishment(educationEstablishmentCode);
// ddlEditSchool.DataValueField = "school_code";
// ddlEditSchool.DataTextField = "school";
// ddlEditSchool.DataBind();
// DropDownList ddlEditBranchOfStudy1 = (DropDownList)e.Row.FindControl
// ("ddlEditBranchOfStudy1");
// ddlEditBranchOfStudy1.DataSource = branchOfStudyBLO.
// SelectBranchOfEstablishment(educationEstablishmentCode);
// ddlEditBranchOfStudy1.DataValueField = "branch_of_study_code";
// ddlEditBranchOfStudy1.DataTextField = "branch_of_study";
// ddlEditBranchOfStudy1.DataBind();
// DropDownList ddlEditCertificate = (DropDownList)e.Row.FindControl
// ("ddlEditCertificate");
// ddlEditCertificate.DataSource = certificateBLO.
// SelectCertificateOfEstablishment(educationEstablishmentCode);
// ddlEditCertificate.DataValueField = "certificate_code";
// ddlEditCertificate.DataTextField = "certificate";
// ddlEditCertificate.DataBind();
// DropDownList ddlEditBranchOfStudy2 = (DropDownList)e.Row.
// FindControl("ddlEditBranchOfStudy2");
// ddlEditBranchOfStudy2.DataSource = branchOfStudyBLO.
// SelectBranchOfEstablishment(educationEstablishmentCode);
// ddlEditBranchOfStudy2.DataValueField = "branch_of_study_code";
// ddlEditBranchOfStudy2.DataTextField = "branch_of_study";
// ddlEditBranchOfStudy2.DataBind();
//}
}
我想要的是，当我在第一个下拉列表中选择时，其他下拉列表将使用第一个下拉列表中的选定值再次进行数据绑定(bind)。请参阅下图。
最佳答案
就像我在评论中所说，您需要找到 DropDownList 所在的 GridViewRow。通过该行，您可以找到所有其他 DropDownList。通过查找其他每个 DropDownList，您的方向是正确的，但您没有在正确的位置查找它们。
protected void ddlEditEducationEstablishment_SelectedIndexChanged(object sender, EventArgs e)
{
// Get the master DropDownList and its value
DropDownList ddlEditEducationEstablishment = (DropDownList)sender;
string educationEstablishmentCode = ddlEditEducationEstablishment.SelectedValue;
// Get the GridViewRow in which this master DropDownList exists
GridViewRow row = (GridViewRow)ddlEditEducationEstablishment.NamingContainer;
// Find all of the other DropDownLists within the same row and bind them
DropDownList ddlEditSchool = (DropDownList)row.FindControl("ddlEditSchool");
ddlEditSchool.DataSource = schoolBLO.SelectSchoolOfEstablishment(educationEstablishmentCode);
ddlEditSchool.DataValueField = "school_code";
ddlEditSchool.DataTextField = "school";
ddlEditSchool.DataBind();
// etc...
}
关于c# - 当同一 Gridview 中的下拉菜单上选定的索引发生更改时，在 Gridview 中绑定(bind)下拉菜单，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30591001/