深入浅出SharePoint——操作Item权限类

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using System;using System.Collections.Generic;using System.Linq;using System.Text;using Microsoft.SharePoint;namespace CR.SharePoint.HR.Common{    public static class PermissionManager    {        //SPGroup group = web.Groups[0];         //SPUser user = web.Users[0];         //SPUser user2 = web.EnsureUser("mangaldas.mano");         //SPUser user3 = web.EnsureUser("Domain Users");         //SPPrincipal[] principals = { group, user, user2, user3 };         #region Adding Permissions to an item        /// <summary>        /// Set Permissions        /// </summary>        /// <param name="item">SPListItem</param>        /// <param name="principals">IEnumerable</param>        /// <param name="roleType">SPRoleType</param>        public static void SetPermissions(SPListItem item, IEnumerable<SPPrincipal> principals, SPRoleType roleType)         {             if (item != null)             {                 foreach (SPPrincipal principal in principals)                 {                     SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetByType(roleType);                     SetPermissions(item, principal, roleDefinition);                 }             }         }                     /// <summary>        /// Set Permissions        /// </summary>        /// <param name="item">SPListItem</param>        /// <param name="user">SPUser</param>        /// <param name="roleType">SPRoleType</param>        public static void SetPermissions(SPListItem item, SPUser user, SPRoleType roleType)         {             if (item != null)             {                 SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetByType(roleType);                 SetPermissions(item, (SPPrincipal)user, roleDefinition);             }         }                   /// <summary>        /// Set Permissions        /// </summary>        /// <param name="item">SPListItem</param>        /// <param name="principal">SPPrincipal</param>        /// <param name="roleType">SPRoleType</param>        public static void SetPermissions(SPListItem item, SPPrincipal principal, SPRoleType roleType)         {             if (item != null)             {                 SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetByType(roleType);                 SetPermissions(item, principal, roleDefinition);             }         }                   /// <summary>        /// Set Permissions        /// </summary>        /// <param name="item">SPListItem</param>        /// <param name="user">SPUser</param>        /// <param name="roleDefinition">SPRoleDefinition</param>        public static void SetPermissions(SPListItem item, SPUser user, SPRoleDefinition roleDefinition)         {             if (item != null)             {                 SetPermissions(item, (SPPrincipal)user, roleDefinition);             }         }                   /// <summary>        /// Set Permissions        /// </summary>        /// <param name="item">SPListItem</param>        /// <param name="principal">SPPrincipal</param>        /// <param name="roleDefinition">SPRoleDefinition</param>        public static void SetPermissions(SPListItem item, SPPrincipal principal, SPRoleDefinition roleDefinition)         {             if (item != null)             {                 SPRoleAssignment roleAssignment = new SPRoleAssignment(principal);                 roleAssignment.RoleDefinitionBindings.Add(roleDefinition);                 item.RoleAssignments.Add(roleAssignment);             }         }        #endregion        #region Deleting all user Permissions from an item        /// <summary>        /// remove permisions        /// </summary>        /// <param name="item">SPListItem</param>        /// <param name="user">SPUser</param>        public static void RemovePermissions(SPListItem item, SPUser user)         {             if (item != null)             {                 RemovePermissions(item, user as SPPrincipal);             }         }                   /// <summary>        /// remove permisions        /// </summary>        /// <param name="item">SPListItem</param>        /// <param name="principal">SPPrincipal</param>        public static void RemovePermissions(SPListItem item, SPPrincipal principal)         {             if (item != null)             {                 item.RoleAssignments.Remove(principal);                 item.SystemUpdate();             }        }        #endregion        #region Removing specific roles from an item        /// <summary>        /// remove permission        /// </summary>        /// <param name="item">SPListItem</param>        /// <param name="principal">SPPrincipal</param>        /// <param name="roleDefinition">SPRoleDefinition</param>        public static void RemovePermissionsSpecificRole(SPListItem item, SPPrincipal principal, SPRoleDefinition roleDefinition)         {             if (item != null)             {                 SPRoleAssignment roleAssignment = item.RoleAssignments.GetAssignmentByPrincipal(principal);                 if (roleAssignment != null)                 {                     if (roleAssignment.RoleDefinitionBindings.Contains(roleDefinition))                     {                         roleAssignment.RoleDefinitionBindings.Remove(roleDefinition);                         roleAssignment.Update();                     }                 }             }         }        /// <summary>        /// remove permission        /// </summary>        /// <param name="item">SPListItem</param>        /// <param name="principal">SPPrincipal</param>        /// <param name="roleType">SPRoleType</param>        public static void RemovePermissionsSpecificRole(SPListItem item, SPPrincipal principal, SPRoleType roleType)         {             if (item != null)             {                 SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetByType(roleType);                 RemovePermissionsSpecificRole(item, principal, roleDefinition);             }         }        #endregion        #region Updating or Modifying Permissions on an item        /// <summary>        /// modify Permissions        /// </summary>        /// <param name="item">SPListItem</param>        /// <param name="principal">SPPrincipal</param>        /// <param name="roleType">SPRoleType</param>        public static void ChangePermissions(SPListItem item, SPPrincipal principal, SPRoleType roleType)         {             if (item != null)             {                 SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetByType(roleType);                 ChangePermissions(item, principal, roleDefinition);             }         }        /// <summary>        /// modify Permissions        /// </summary>        /// <param name="item">SPListItem</param>        /// <param name="principal">SPPrincipal</param>        /// <param name="roleDefinition">SPRoleDefinition</param>        public static void ChangePermissions(SPListItem item, SPPrincipal principal, SPRoleDefinition roleDefinition)         {             SPRoleAssignment roleAssignment = item.RoleAssignments.GetAssignmentByPrincipal(principal);                         if (roleAssignment != null)             {                 roleAssignment.RoleDefinitionBindings.RemoveAll();                 roleAssignment.RoleDefinitionBindings.Add(roleDefinition); roleAssignment.Update();             }         }        #endregion    }}