diff --git a/XCode/Membership/PermissionFlags.cs b/XCode/Membership/PermissionFlags.cs
index 5e971b589..4b53153aa 100644
--- a/XCode/Membership/PermissionFlags.cs
+++ b/XCode/Membership/PermissionFlags.cs
@@ -5,7 +5,7 @@ namespace XCode.Membership;
 /// <summary>操作权限</summary>
 [Flags]
 [Description("操作权限")]
-public enum PermissionFlags
+public enum PermissionFlags : UInt32
 {
     /// <summary>无权限</summary>
     [Description("无权限")]
@@ -29,5 +29,5 @@ public enum PermissionFlags
 
     /// <summary>所有权限</summary>
     [Description("所有")]
-    All = 0x7FFFFFFF,
+    All = 0xFFFFFFFF,
 }
diff --git a/XCode/Membership/角色.Biz.cs b/XCode/Membership/角色.Biz.cs
index 0702a088a..39a74fb2d 100644
--- a/XCode/Membership/角色.Biz.cs
+++ b/XCode/Membership/角色.Biz.cs
@@ -346,7 +346,7 @@ public partial class Role : LogEntity<Role>, IRole
 
     /// <summary>当前角色拥有的资源</summary>
     [XmlIgnore, ScriptIgnore, IgnoreDataMember]
-    public Int32[] Resources { get { return Permissions.Keys.ToArray(); } }
+    public Int32[] Resources => Permissions.Keys.ToArray();
     #endregion
 
     #region 业务
diff --git a/XUnitTest.XCode/Membership/PermissionFlagsTests.cs b/XUnitTest.XCode/Membership/PermissionFlagsTests.cs
new file mode 100644
index 000000000..c11ce0b81
--- /dev/null
+++ b/XUnitTest.XCode/Membership/PermissionFlagsTests.cs
@@ -0,0 +1,23 @@
+using System;
+using XCode.Membership;
+using Xunit;
+
+namespace XUnitTest.XCode.Membership;
+
+public class PermissionFlagsTests
+{
+    [Fact]
+    public void Test1()
+    {
+        var pm = (PermissionFlags)0xFFFFFFFF;
+        Assert.Equal(PermissionFlags.All, pm);
+        Assert.Equal(0xFFFFFFFF, (UInt32)pm);
+        Assert.Equal(-1, (Int32)pm);
+
+        var v = -1;
+        pm = (PermissionFlags)v;
+        Assert.Equal(PermissionFlags.All, pm);
+        Assert.Equal(0xFFFFFFFF, (UInt32)pm);
+        Assert.Equal(-1, (Int32)pm);
+    }
+}