Checking the current user's permission on a web site or a list by code
SPWeb has a "CurrentUser" attribute which gives you a SPUser object. the GetAssignmentByPrincipal
function of the RoleAssignments collection of the SPWeb object will get
you what roles the current user has.
here is an example:
SPWeb web = SPControl.GetContextWeb(this.Context);
SPRoleAssignment assignment = web.RoleAssignments.GetAssignmentByPrincipal((SPPrincipal) web.CurrentUser);
StringBuilder sb = new StringBuilder("");
foreach (SPRoleDefinition role in assignment.RoleDefinitionBindings)
{
sb.AppendLine(role.Name);
sb.AppendLine(role.BasePermissions);
sb.AppendLine("--------------------------------------");
}
This sample will give you a string with all the information. if you want to check if a use is allowed to add list items
note - don't dispose of the SPWeb object in the example above, since it comes from the context.
another note - this checks the web site permissions -
not the permissions for a specific list. if you want to check a list
you will have to get the roles from an SPList object. in the following
example I am doing the same for the announements list in the current
site:
SPList list = SPControl.GetContextWeb(this.Context).Lists["Announcements"];
SPRoleAssignment assignment = list.RoleAssignments.GetAssignmentByPrincipal((SPPrincipal) web.CurrentUser);
StringBuilder sb = new StringBuilder("");
foreach (SPRoleDefinition role in assignment.RoleDefinitionBindings)
{
sb.AppendLine(role.Name);
sb.AppendLine(role.BasePermissions);
sb.AppendLine("--------------------------------------");
}
Link : http://www.sharepoint-tips.com/2008/04/checking-current-users-permission-on.html