在项目添加的事件接收器中找不到ID为237的委托人

问题描述

am试图删除现有权限并为splist项添加新的权限，在itemadded事件接收器内部:am出现错误w

am trying to remove existing permissions and add new permsision for an splist item , inside itemadded event receiver:am getting error with getting SPPrincipals,.

这是独家新闻:我需要授予对SPItem的权限.我得到了SPUser:

Here is the scoop: I need to grant permissions to SPItem. I get SPUser:

SPUser user = web.AllUsers.GetByID    // {i:0#.w|domain\ad_name}

检查用户当前的权限:

Check what current permissions for the user:

SPRoleAssignment currentUserRole = item.RoleAssignments.GetAssignmentByPrincipal(user);

收到异常:

Getting exception:

 如何解决此问题?

 how to  resolve this ?

推荐答案

我认为您的用户属于一个组，因此您可以不能获取基于用户的SPRoleAssignment.

例如:

Userb属于站点组开发人员成员 .

我拥有父项的listitem继承权限，因此userb拥有列表项的编辑权限.

我们可以根据小组负责人获得SPRoleAssignment无法基于userb获得SPRoleAssignment.

//fine
                    SPGroup group = web.SiteGroups["Developer Members"];
                    SPRoleAssignment rag = item.RoleAssignments.GetAssignmentByPrincipal(group);
                    //error, except you break permission for the list item once
                    SPUser userb = web.EnsureUser("contoso\\userb");
                    SPRoleAssignment rag1 = item.RoleAssignments.GetAssignmentByPrincipal(userb); 

如果您想直接授予用户权限，请尝试使用以下代码:

SPList list = web.Lists.TryGetList("MyList");
                    SPListItem item = list.Items[0];
                    //SPGroup group = web.SiteGroups["Developer Members"];
                    //SPRoleAssignment rag= item.RoleAssignments.GetAssignmentByPrincipal(group);

                    //SPUser usera = web.EnsureUser("contoso\\usera");
                    //SPRoleAssignment raga = item.RoleAssignments.GetAssignmentByPrincipal(usera);
                    SPUser userb = web.EnsureUser("contoso\\userb");
                    //SPRoleAssignment rag1 = item.RoleAssignments.GetAssignmentByPrincipal(userb);
                    SPRoleAssignment roleAssignment = new SPRoleAssignment(userb);
                    SPRoleDefinition roleDefinition = web.RoleDefinitions.GetByType(SPRoleType.Contributor);
                    roleAssignment.RoleDefinitionBindings.Add(roleDefinition);
                    if (!item.HasUniqueRoleAssignments)
                    {
                        item.BreakRoleInheritance(true); // Ensure we don't inherit permissions from parent
                        SPRoleAssignmentCollection SPRoleAssColn = item.RoleAssignments;
                        for (int i = SPRoleAssColn.Count - 1; i >= 0; i--)
                        {
                            SPRoleAssColn.Remove(i);
                        }
                        Console.WriteLine("All Permissions Removed");
                    }
                    item.RoleAssignments.Add(roleAssignment);
                    item.Update();
                }
                Console.WriteLine("done");
                Console.ReadKey();

最好的问候，

Lee

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