How to use button in repeater control?

问题:

I am using asp.net 3.5 with c#.I want to invoke button click event inside repeater control.

<asp:Repeater ID="rptFriendsList"
    runat="server" 
    onitemcommand="rptFriendsList_ItemCommand">
    <ItemTemplate> 
        <asp:ImageButton ID="btnSave"
                         runat="server" 
                         ImageUrl="~/Contents/Images/save_button.png"
                         CommandName="Schedule"
                         UseSubmitBehavior="False"  />
    </ItemTemplate>
</asp:Repeater>

but when i click to a button its giving an error

"Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation."

my purpose is to execute some code in button click which is placed inside the repeater.Please help me to solve this issue.Thanks in advance.

回答1:

UseSubmitBehavior="False" this property you have used is not present with the image button have you over ridden imagebutton class and added this property.

回答2:

This also happens when you have assigned the datasource and data bound your repeater in the OnLoad event rather than OnInit

回答3:

You can't use button, because button create postback on click and also itemcommand of repeater called!

But, If you want to use asp:button instead of asp:linkbutton, you have to set UseSubmitBehavior property of button to false. its means, button dont make postback.

<asp:Button ID="btnAccept" runat="server" Text="Accept All" CssClass="vb-default vb-green vb-txt-light" CommandName="Accept" CommandArgument='<%# Eval("UserID") %>' UseSubmitBehavior="false" />

回答4:

<asp:Repeater ID="Repeater1" runat="server"      OnItemCommand="Repeater1_OnItemCommand"  DataSourceID="SqlDataSource1">


            <ItemTemplate>
                key1:
                <asp:Label ID="key1Label" runat="server" Text='<%# Eval("key1") %>'></asp:Label><br />
                key2:
                <asp:Label ID="key2Label" runat="server" Text='<%# Eval("key2") %>'></asp:Label><br />
                key3:
                <asp:Label ID="key3Label" runat="server" Text='<%# Eval("key3") %>'></asp:Label><br />
                <asp:TextBox ID="col1" runat="server" Text='<%# Eval("col1") %>'></asp:TextBox>
                <asp:TextBox ID="col2" runat="server" Text='<%# Eval("col2") %>'></asp:TextBox>


                <br />


                <asp:linkbutton ID="Linkbutton1" commandname="Update" runat="server" text="Update"  CommandArgument='<%# Eval("key1") +"|"+Eval("key2")+"|"+ Eval("key3") %>' />
               <asp:linkbutton ID="Linkbutton2" commandname="Cancel" runat="server" text="Cancel" />


            </ItemTemplate>



 protected void Repeater1_OnItemCommand(object source, RepeaterCommandEventArgs e)
    {
        if (e.CommandName == "Update")
        {

            string col1 = ((TextBox)e.Item.FindControl("col1")).Text;
            string col2 = ((TextBox)e.Item.FindControl("col2")).Text;


            string allKeys = Convert.ToString(e.CommandArgument);

            string[] arrKeys = new string[2];
            char[] splitter = { '|' };
            arrKeys = allKeys.Split(splitter);



            SqlDataSource1.UpdateParameters["col1"].DefaultValue = col1;
            SqlDataSource1.UpdateParameters["col2"].DefaultValue = col2;

            SqlDataSource1.UpdateParameters["key1"].DefaultValue = arrKeys[0];
            SqlDataSource1.UpdateParameters["key2"].DefaultValue = arrKeys[1];
            SqlDataSource1.UpdateParameters["key3"].DefaultValue = arrKeys[2];


            SqlDataSource1.Update();          

            Repeater1.DataBind();

        }
    }

回答5:

I have used this bellow code and runs ok use this bellow code in .aspx page

<asp:Repeater ID="Repeater1" runat="server" OnItemCommand="Repeater1_ItemCommand">
    <HeaderTemplate>
        <table>
            <tr>
                <th>
                    Edit
                </th>
            </tr>
        </table>
    </HeaderTemplate>
    <ItemTemplate>
        <table>
            <tr>
                <td align="center">
                    <asp:LinkButton ID="LinkButton1" runat="server" CommandName="Edit">Edit</asp:LinkButton>
                </td>
            </tr>
        </table>
    </ItemTemplate>
</asp:Repeater>

Use this in .cs Make the event Repeater1_ItemCommand

protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
{

    switch (e.CommandName)
    {
        case "Edit":
            // Do some stuff when the Edit button is clicked.

            break;

        // Other commands here.

        default:
            break;
    }

}

回答6:

Set page EnableEventValidation="false".

回答7:

if you're adding items server side, try to assign unique ID to each ImageButton