Add a base permission to an existing role definition in sharepoint using CSOM

Question

I have to add a base permission to an existing role definition in sharepoint using CSOM Managed API in SP2013, to update base permission of a permission level. I did use below code . But Role definition is not getting updated. What could be the reason? I
have updated RoleDefinition and Web as well but it did not help.
  RoleDefinition rd = oClientContext.Web.RoleDefinitions.GetByName("My Permission");
                      if (!rd.BasePermissions.Has(PermissionKind.ManagePermissions))
                          rd.RoleTypeKind.ToString();
                          rd.BasePermissions.Set(PermissionKind.ManagePermissions);
                          rd.Update();
oClientContext.Web.Update();
                          oClientContext.ExecuteQuery();
Ashish Baranwal To know what you know and what you do not know, that is true knowledge

Answer 1

Hi Ashish,
I tested the same scenario per your post in my environment, and I got the same results as you got.                                                                                                                                                                  
As a workaround, I recommend to delete the permission level and then recreate the permission level with the needed permissions:
ClientContext ctx=new ClientContext("http://sp");
RoleDefinition rd=ctx.Web.RoleDefinitions.GetByName("My Permission");
ctx.Load(rd);
ctx.ExecuteQuery();
if(!rd.BasePermissions.Has(PermissionKind.ManagePermissions))
rd.DeleteObject();
BasePermissions permissions = new BasePermissions();
//add the permissions needed
permissions.Set(PermissionKind.ManagePermissions);
RoleDefinitionCreationInformation roleDefinitionCreationInfo = new RoleDefinitionCreationInformation();
roleDefinitionCreationInfo.BasePermissions = permissions;
roleDefinitionCreationInfo.Name = "My Permission";
roleDefinitionCreationInfo.Description = "My Custom Permission Level";
RoleDefinition roleDefinition = context.Web.RoleDefinitions.Add(roleDefinitionCreationInfo);
context.ExecuteQuery();
Best regards.
Thanks
Victoria Xia
TechNet Community Support