C# – Convert Gridview column from ID to String in ItemTemplate

asp.netc++controlsgridview

I currently have a Gridview that displays

TypeID , Name , Description.

I would like to display the actual type name instead of the TypeID in the gridview. I created this function that takes in the ID and returns the Name but I am having trouble using it. There are 15-20 different types so How do I convert the TypeID to a Type Name so that it is displayed when the Gridview is rendered.

protected string GetGenericTypeByID(int genericTypeID)
        {
            string genericTypeName;

            GenericType.Generic_TypeDataTable genericTypeNameDS = new GenericType.Generic_TypeDataTable();
            genericTypeNameDS = GenericBO.Get_GenericTypeByID(genericTypeID);

            genericTypeName = genericTypeNameDS[0]["Generic_Type_Name"].ToString();









            return genericTypeName;

        }

I thought I would be able to use the function in the ItemTemplate but it seems to be harder that I thought

 <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Bind("GetGenericTypeByID("Generic_Type_ID")")%>'></asp:Label>
                </ItemTemplate>

Thanks to Everyone who helped me solve this problem.
I ended up using the method below and it works perfectly.
GetGenericTypeByID( Convert.ToInt32(Eval("Generic_Type_ID")))

Best Solution

You've got the 'bind/eval' and method call inside out.
See Using Method inside a DataGrid or GridView TemplateField

<asp:TemplateField HeaderText=”Name”>
<ItemTemplate>
    <a href='<%# FormatUrl(Eval(”email1″).ToString())%>'><%# Eval(”fname”) %>,&nbsp;<%# Eval(”lname”) %></a>
</ItemTemplate>

With the 'FormatUrl' function being:

public string FormatUrl(string email)
{
    return “mailto:” + email;
}

This is the style that Microsoft tends to use in their examples.

It appears that the guidance in this area may have changed, as StyleCop now enforces the use of the C# specific aliases.

C# – Convert a string to an enum in C#

In .NET Core and .NET Framework ≥4.0 there is a generic parse method:

Enum.TryParse("Active", out StatusEnum myStatus);

This also includes C#7's new inline out variables, so this does the try-parse, conversion to the explicit enum type and initialises+populates the myStatus variable.

If you have access to C#7 and the latest .NET this is the best way.

Original Answer

In .NET it's rather ugly (until 4 or above):

StatusEnum MyStatus = (StatusEnum) Enum.Parse(typeof(StatusEnum), "Active", true);

I tend to simplify this with:

public static T ParseEnum<T>(string value)
{
    return (T) Enum.Parse(typeof(T), value, true);
}

Then I can do:

StatusEnum MyStatus = EnumUtil.ParseEnum<StatusEnum>("Active");

One option suggested in the comments is to add an extension, which is simple enough:

public static T ToEnum<T>(this string value)
{
    return (T) Enum.Parse(typeof(T), value, true);
}

StatusEnum MyStatus = "Active".ToEnum<StatusEnum>();

Finally, you may want to have a default enum to use if the string cannot be parsed:

public static T ToEnum<T>(this string value, T defaultValue) 
{
    if (string.IsNullOrEmpty(value))
    {
        return defaultValue;
    }

    T result;
    return Enum.TryParse<T>(value, true, out result) ? result : defaultValue;
}

Which makes this the call:

StatusEnum MyStatus = "Active".ToEnum(StatusEnum.None);

However, I would be careful adding an extension method like this to string as (without namespace control) it will appear on all instances of string whether they hold an enum or not (so 1234.ToString().ToEnum(StatusEnum.None) would be valid but nonsensical) . It's often be best to avoid cluttering Microsoft's core classes with extra methods that only apply in very specific contexts unless your entire development team has a very good understanding of what those extensions do.

Best Solution

Related Solutions

C# – the difference between String and string in C#

This is the style that Microsoft tends to use in their examples.

C# – Convert a string to an enum in C#

Original Answer

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