I am attempting to dynamically hide a button based on the user's role, using this code snippet:
<asp:Button ID="btndisplayrole" Text="Admin Button" Visible='<%= WebApplication1.SiteHelper.IsUserInRole("Admin") %>' runat="server" OnClick="DisplayRoleClick" />
However, when I execute the above code, I encounter the following error message:
Unable to convert string '<%= WebApplication1.SiteHelper.IsUserInRole("Admin") %>' into object type 'System.Boolean' for the 'Visible' property.
Here is another approach:
<% if (RoleManager.CheckUserRole("Admin")) {
%>
<button id="adminButton"
type="button"
onclick="displayAdminRole()">
Admin Button
</button>
<% } %>
It's an intriguing issue at hand. The error message indicates that the string
<%= WebApplication1.SiteHelper.IsUserInRole("Admin") %>Unfortunately, I am unable to clarify why the expression isn't evaluated as intended, but is instead treated as a string.
The reason why your <%# %> expression functions correctly is because it undergoes a different treatment. During compilation of the Page into a class, the compiler generates an event handler like this:
public void __DataBindingButton2(object sender, EventArgs e)
{
Button button = (Button) sender;
Page bindingContainer = (Page) button.BindingContainer;
button.Visible = HttpContext.Current.User.IsInRole("admin");
}
This method is then attached to the Control.Databinding event on your control. As demonstrated, the <%# %> is appropriately recognized as server-side code, not simply as a random string.
Therefore, it seems that using databinding or following AndreasKnudsen's advice to modify the codebehind could be potential solutions.
The code below was successful:
IsVisible='<%# MyApplication.Helpers.RoleManager.IsUserInRole("Admin") %>'
Please take note that the above snippet utilizes a binding expression!
Why not handle this in the code-behind? For example, you could implement it in the Page_Load event.
protected void Page_Load(object sender, EventArgs e)
{
btndisplayrole.Visible = WebApplication1.SiteHelper.IsUserInRole("Admin");
}
Displayed='<%= ApplicationHelper.IsUserInRole("Admin").ToString() %>'
OR
Displayed=<%= ApplicationHelper.IsUserInRole("Admin") %>
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