本篇内容主要讲解“C#怎么通过权限类和权限属性来修改安全权限”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“C#怎么通过权限类和权限属性来修改安全权限”吧!

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using System;
using System.Security;
using System.Security.Permissions;
using System.Runtime.InteropServices;

class NativeMethods
{
    [DllImport("msvcrt.dll")]
    public static extern int puts(string str);
    [DllImport("msvcrt.dll")]
    internal static extern int _flushall();
}

class MainClass
{
    private static void CallUnmanagedCodeWithoutPermission()
    {
        SecurityPermission perm = 
           new SecurityPermission(SecurityPermissionFlag.UnmanagedCode);

        perm.Deny();

        try
        {
            Console.WriteLine("Attempting to call unmanaged code without permission.");
            NativeMethods.puts("Hello World!");
            NativeMethods._flushall();
            Console.WriteLine("Called unmanaged code without permission. Whoops!");
        }
        catch (SecurityException)
        {
            Console.WriteLine("Caught Security Exception attempting to call unmanaged code.");
        }
    }

    private static void CallUnmanagedCodeWithPermission()
    {
        SecurityPermission perm = 
           new SecurityPermission(SecurityPermissionFlag.UnmanagedCode);

        perm.Assert();

        try
        {
            Console.WriteLine("Attempting to call unmanaged code with permission.");
            NativeMethods.puts("Hello World!");
            NativeMethods._flushall();
            Console.WriteLine("Called unmanaged code with permission.");
        }
        catch (SecurityException)
        {
            Console.WriteLine("Caught Security Exception attempting to call unmanaged code. Whoops!");
        }
    }

    public static void Main() 
    {
        SecurityPermission perm = new 
            SecurityPermission(SecurityPermissionFlag.UnmanagedCode);
        perm.Assert();
        CallUnmanagedCodeWithoutPermission();

        perm.Deny();
        CallUnmanagedCodeWithPermission();
    }
}

using System;
using System.Security;
using System.Security.Permissions;
using System.Runtime.InteropServices;

class NativeMethods
{
    [DllImport("msvcrt.dll")]
    public static extern int puts(string str);
    [DllImport("msvcrt.dll")]
    internal static extern int _flushall();
}

class MainClass
{
    [SecurityPermission(SecurityAction.Deny, Flags = 
       SecurityPermissionFlag.UnmanagedCode)]
    private static void CallUnmanagedCodeWithoutPermission()
    {
        try
        {
            Console.WriteLine("Attempting to call unmanaged code without permission.");
            NativeMethods.puts("Hello World!");
            NativeMethods._flushall();
            Console.WriteLine("Called unmanaged code without permission. Whoops!");
        }
        catch (SecurityException)
        {
            Console.WriteLine("Caught Security Exception attempting to call unmanaged code.");
        }
    }

    [SecurityPermission(SecurityAction.Assert, Flags = 
       SecurityPermissionFlag.UnmanagedCode)]
    private static void CallUnmanagedCodeWithPermission()
    {
        try
        {
            Console.WriteLine("Attempting to call unmanaged code with permission.");
            NativeMethods.puts("Hello World!");
            NativeMethods._flushall();
            Console.WriteLine("Called unmanaged code with permission.");
        }
        catch (SecurityException)
        {
            Console.WriteLine("Caught Security Exception attempting to call unmanaged code. Whoops!");
        }
    }

    public static void Main() 
    {
        SecurityPermission perm = new
            SecurityPermission(SecurityPermissionFlag.UnmanagedCode);

        perm.Assert();
        CallUnmanagedCodeWithoutPermission();

        perm.Deny();
        CallUnmanagedCodeWithPermission();
    }
}

using System;
using System.Security;
using System.Security.Permissions;
using System.Runtime.InteropServices;

class NativeMethods
{
    [SuppressUnmanagedCodeSecurityAttribute()]
    [DllImport("msvcrt.dll")]
    internal static extern int puts(string str);
    [SuppressUnmanagedCodeSecurityAttribute()]
    [DllImport("msvcrt.dll")]
    internal static extern int _flushall();
}

class MainClass
{
    [SecurityPermission(SecurityAction.Deny, Flags = 
       SecurityPermissionFlag.UnmanagedCode)]
    private static void CallUnmanagedCodeWithoutPermission()
    {
        try
        {
            UIPermission uiPermission = 
               new UIPermission(PermissionState.Unrestricted);
            uiPermission.Demand();

            Console.WriteLine("Attempting to call unmanaged code without UnmanagedCode permission.");
            NativeMethods.puts("Hello World!");
            NativeMethods._flushall();
            Console.WriteLine("Called unmanaged code without UnmanagedCode permission.");
        }
        catch (SecurityException)
        {
            Console.WriteLine("Caught Security Exception attempting to call unmanaged code.");
        }
    }

    [SecurityPermission(SecurityAction.Assert, Flags = 
       SecurityPermissionFlag.UnmanagedCode)]
    private static void CallUnmanagedCodeWithPermission()
    {
        try
        {
            Console.WriteLine("Attempting to call unmanaged code with permission.");
            NativeMethods.puts("Hello World!");
            NativeMethods._flushall();
            Console.WriteLine("Called unmanaged code with permission.");
        }
        catch (SecurityException)
        {
            Console.WriteLine("Caught Security Exception attempting to call unmanaged code. Whoops!");
        }
    }

    public static void Main() 
    {
        SecurityPermission perm = new
            SecurityPermission(SecurityPermissionFlag.UnmanagedCode);

       perm.Assert();
       CallUnmanagedCodeWithoutPermission();

       perm.Deny();
       CallUnmanagedCodeWithPermission();
    }
}

到此，相信大家对“C#怎么通过权限类和权限属性来修改安全权限”有了更深的了解，不妨来实际操作一番吧！这里是创新互联建站网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！

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