Conditional Operator in ASP.net Databound Field (C#)

Question

I am trying to implement conditional formatting in a databound field in a DataList, but the error: Invalid expression term 'if' is being generated. My code is as follows:

<asp:DataList ID="dlItems" runat="server">
    <ItemTemplate>
        <asp:Label ID="lblDescription" runat="server" Text='
            <%# if (Eval("Description").ToString().Length <= 150)
            // The error is generated by the 'if' on the above line
                    Eval("Description");
                else
                    Eval("Description").ToString().PadRight(150).Substring(0,150).TrimEnd(); %>'>
        </asp:Label>
    </ItemTemplate>
</asp:DataList>

Note: The code in the else statement is largely irrelevant; I get the same error even when it's excluded.

Monah · Accepted Answer · 2016-03-10 08:15:02Z

2

You can use the following

<asp:DataList ID="dlItems" runat="server">
    <ItemTemplate>
        <asp:Label ID="lblDescription" runat="server" Text='
            <%# Eval("Description").ToString().Length <= 150?Eval("Description"):          
                    Eval("Description").ToString().PadRight(150).Substring(0,150).TrimEnd() %>'>
        </asp:Label>
    </ItemTemplate>
</asp:DataList>

hope it will help you

answered Mar 10, 2016 at 8:15

Monah

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3 Comments

grandta13 Over a year ago

Thanks, that did it. To make sure I understand how this works, I would like to ask if the following assumptions are correct: ? is used to end the test statement. | : is used to start an else clause. Also, I would like to ask where I can find more information on the DataBinder.Eval() method. My searches so far have mostly only returned documenation on the basic use of the Eval() method.

Monah Over a year ago

conditional operator is : condition ? first_expression : second_expression; if the condition was true then first expression is evaluated else the second expression becomes the result, for more information check here msdn.microsoft.com/en-us/library/ty67wk28.aspx

grandta13 Over a year ago

Thanks, I'd not seen that before and it seems very useful.

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