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！
