How to pass multiple values through command argument in Asp.net ListView?

Question

I'm trying to pass multiple values through command argument tag in a listview. All the questions here are referring to GridView instead of a listview (I'm not sure if it makes a difference). I'm getting an error that Input String is not in correct format.

My code is:

aspx:

<asp:Button runat="server" Text="View Details" CssClass="button" CommandName="ViewApplicationDetails" CommandArgument='<%# Eval("id") + "|" + Eval("email") + "|" + Eval("application_hash")%>'/>

VB.NET:

Private Sub ListView1_ItemCommand(sender As Object, e As ListViewCommandEventArgs) Handles ListView1.ItemCommand
    If e.CommandName = "ViewApplicationDetails" Then
        Dim strAttributes As String()

        strAttributes = e.CommandArgument.ToString().Split("|")
        'Do something 
    End If
End Sub

the line that has asp button in it. The error is "System.FormatException: Input string was not in a correct format." It works fine when i keep one value in the command argument — user7441202
– user7441202, Commented May 4, 2017 at 9:37

Community · Accepted Answer · 2017-05-23 12:26:04Z

1

String concatenation with "+" might be unreliable at times in VB.Net. See this thread for discussion. That could be what you are facing. Things to try instead are "&" operator:

Eval("id") & "|" & Eval("email") & ...

or String.Format (readability boost for free):

String.Format("{0}|{1}|{2}", Eval("id"), Eval("email"), ...)

edited May 23, 2017 at 12:26

CommunityBot

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answered May 4, 2017 at 9:44

Andrei

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1 Comment

user7441202 Over a year ago

Thank you Andrei. All i had to do was to use "&" instead of "+"

Techygal · Accepted Answer · 2017-05-04 09:54:51Z

1

Can you please try with this

String.Format method:

CommandArgument='<%# String.Format("{0} {1} {2}", DataBinder.Eval(Container, "DataItem.id"), DataBinder.Eval(Container, "DataItem.email"), DataBinder.Eval(Container, "DataItem.application_hash")) %>'

Please let me know whether you are able to fix.

answered May 4, 2017 at 9:54

Techygal

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