如何在(C#/ .NET/WinForms)程序中构建RUNAS/NETONLY功能？

在C#/ .NET/WinForms程序中构建RUNAS/NETONLY功能，可以通过以下步骤实现：

使用Windows API函数CreateProcessWithLogonW创建一个新的进程，并指定用户凭据。

using System;
using System.Runtime.InteropServices;

public class ProcessUtil
{
    [DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern bool CreateProcessWithLogonW(
        string userName,
        string domain,
        string password,
        LogonFlags logonFlags,
        string appName,
        string cmdLine,
        CreationFlags creationFlags,
        IntPtr environmentBlock,
        string currentDirectory,
        ref STARTUPINFO startupInfo,
        out PROCESS_INFORMATION processInformation);
}

在WinForms程序中添加一个按钮，并在按钮的Click事件中调用CreateProcessWithLogonW函数。

private void button1_Click(object sender, EventArgs e)
{
    string username = "username";
    string domain = "domain";
    string password = "password";
    string appName = "notepad.exe";
    string cmdLine = "";
    IntPtr environmentBlock = IntPtr.Zero;
    string currentDirectory = "";
    STARTUPINFO startupInfo = new STARTUPINFO();
    PROCESS_INFORMATION processInformation = new PROCESS_INFORMATION();

    bool result = ProcessUtil.CreateProcessWithLogonW(
        username,
        domain,
        password,
        LogonFlags.LOGON_WITH_PROFILE,
        appName,
        cmdLine,
        CreationFlags.NORMAL_PRIORITY_CLASS,
        environmentBlock,
        currentDirectory,
        ref startupInfo,
        out processInformation);

    if (result)
    {
        MessageBox.Show("Process created successfully.");
    }
    else
    {
        MessageBox.Show("Failed to create process.");
    }
}

在程序中定义相关的结构体和枚举类型。

public enum LogonFlags
{
    LOGON_WITH_PROFILE = 1,
    LOGON_NETCREDENTIALS_ONLY = 2
}

public enum CreationFlags
{
    NORMAL_PRIORITY_CLASS = 0x00000020
}

[StructLayout(LayoutKind.Sequential)]
public struct STARTUPINFO
{
    public int cb;
    public string lpReserved;
    public string lpDesktop;
    public string lpTitle;
    public int dwX;
    public int dwY;
    public int dwXSize;
    public int dwYSize;
    public int dwXCountChars;
    public int dwYCountChars;
    public int dwFillAttribute;
    public int dwFlags;
    public short wShowWindow;
    public short cbReserved2;
    public IntPtr lpReserved2;
    public IntPtr hStdInput;
    public IntPtr hStdOutput;
    public IntPtr hStdError;
}

[StructLayout(LayoutKind.Sequential)]
public struct PROCESS_INFORMATION
{
    public IntPtr hProcess;
    public IntPtr hThread;
    public int dwProcessId;
    public int dwThreadId;
}

通过以上步骤，可以在C#/ .NET/WinForms程序中构建RUNAS/NETONLY功能。