查找嵌套Repeater控件内部控制(Find Controls nested inside Rep

2019-08-18 06:18发布

我试图找到其在直放站虽然用户控件呈现的文本框的值,即中继器具有为用户控件的占位符,该用户控件里面就是文本框标记确实存在。 我以前直接前直放站的文本框,这是相当简单的做到了这一点,我想知道为什么这显然不能以同样的方式来完成。 下面是与中继器,其中包含一个占位符的默认页面...

 <asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<form class="formee">
    <fieldset>
         <legend>Faculty Information</legend>
         <div class="grid-4-12">
             <asp:Label ID="lblFirstName1" runat="server" Text="First Name"></asp:Label>
             <asp:Label ID="lblFirstName2" runat="server" Text="" ></asp:Label>
             <asp:Label ID ="lblSalary" runat="server" Text="" ClientIDMode="Static"></asp:Label>
        </div>
        <div class="grid-6-12">
            <asp:Label ID="lblLastName1" runat="server" Text="Last Name"></asp:Label>
            <asp:Label ID="lblLastName2" runat="server" Text=""></asp:Label>
        </div>
    </fieldset>
</form>
<div id="repeaterDiv">
    <asp:Repeater ID="rptBudget" runat="server" ClientIDMode="Static">
        <ItemTemplate>
                <asp:PlaceHolder ID="phBudget" runat="server" EnableViewState="true" />
                    <br />
        </ItemTemplate>
    </asp:Repeater>

    <asp:Button ID="btnAddBudgetControl" runat="server" Text="Add"
                CausesValidation="false" OnClick="AddBudgetControl" CssClass="addBudgetControl"/>
    <asp:Button ID="btnDisplayEntries" runat="server" Text="Display Entries" CausesValidation="false" OnClick="DisplayEntries" />
</div>
<div>
    <asp:TextBox ID="txtTotalPercent" runat="server"  ClientIDMode="Static"></asp:TextBox>
    <asp:TextBox ID="txtGrandTotal" runat="server" ClientIDMode="Static"></asp:TextBox>
    <asp:Label ID="lblCtrls" runat="server" Text=""></asp:Label>
</div>

而哪些插入占位符的地方的用户控件...

 <fieldset>
        <legend>Faculty Salary Form</legend>
        <table cellspacing="10" id="values">
            <tr>
                <td>
                    <asp:Label ID="lblServiceType" runat="server" Text="Service"></asp:Label>
                    <asp:DropDownList runat="server" ID="ddlServiceType" CssClass="serviceType" />
                </td>
                <td>
                    <asp:Label ID="lblSpeedCode" runat="server" Text="Speed Code"></asp:Label>
                    <asp:DropDownList runat="server" ID="ddlSpeedCode" CssClass="speedType" />
                </td>
                <td>
                    <asp:Label ID="lblPercentage" runat="server" Text="Percentage"></asp:Label>
                    <asp:Textbox ID="txtPercentage" runat="server" CssClass="percentCommitment" ClientIDMode="Static" EnableViewState="true" />
                </td>
                <td>
                    <asp:Label ID="lblTotal" runat="server" Text="Total"></asp:Label>
                    <asp:TextBox ID="txtTotal" runat="server" CssClass="amountCommitment" ClientIDMode="Static"  EnableViewState="true"/>
                </td>
                <td>
                    <asp:Button ID="btnRemove" runat="server" Text="Remove Item" OnClick="RemoveItem" ClientIDMode="Static" CssClass="btnRemove" />
                </td>
            </tr>
            <tr>
            </tr>
        </table>
    </fieldset>

......但是,当下面的代码显示按钮的OnClick运行时,我总是对任何和空值的用户控件的所有文本框(和下拉菜单)...

protected void DisplayEntries(object sender, EventArgs e)
{
    foreach (RepeaterItem repeated in rptBudget.Items)
    {
        TextBox txtPercentage = (TextBox)repeated.FindControl("txtPercentage");
        if (txtPercentage == null)
        {
            lblCtrls.Text += " null; ";
        }
        else
        {
            lblCtrls.Text += txtPercentage.Text + "; ";
        }
    }
}

什么是访问这些值的最佳方式? 谢谢。

Answer 1:

txtPercentage文本框位于内部的用户控件,那么使用以下助手方法来检索它。

helper方法

public static Control FindControlRecursive(Control root, string id)
{
   if (root.ID == id) 
     return root;

   return root.Controls.Cast<Control>()
      .Select(c => FindControlRecursive(c, id))
      .FirstOrDefault(c => c != null);
}

用法

foreach (RepeaterItem repeated in rptBudget.Items)
{
   TextBox txtPercentage =            
      (TextBox)FindControlRecursive(repeated, "txtPercentage");  
   ...   
}


Answer 2:

您需要首先获得用户控件, 然后使用FindControl在UC本身。



Answer 3:

首先尝试加载占位符,然后寻找占位符文本框:

事情是这样的:

var ph = repeated.FindControl("phBudget");
var txtBox = ph.FindControl("txtPercentage");

/伪



文章来源: Find Controls nested inside Repeater Control