检查.NET 3.5并启用（如果已禁用）

使用点网代码可以轻松完成此操作。作为，

1. 使用适当的参数启动Dism进程。
2. 不要使用ShellExecute。
3. 重定向标准输出。
4. 读取标准输出。

Vb.net代码：

Public Function GetDismOutput() As String
        Dim Output As String = Nothing
        Dim SxsPath As String = "D:\Sources\sxs"
        Dim CmdParm As String = "/online /enable-feature /featurename:NetFX3 /All /Source:"""
        Dim Pinf As New ProcessStartInfo With {.FileName = SxsPath, .Arguments = CmdParm + SxsPath + """ /LimitAccess"}
        Dim Prc As Process
        Try
            Pinf.UseShellExecute = False
            Pinf.RedirectStandardOutput = True
            Prc = Process.Start(Pinf)
            Prc.WaitForExit(20 * 60 * 1000) '' Wait for 20 Minutes
            CmdParm = Prc.StandardOutput.ReadToEnd()
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
        Return Output
    End Function

C＃代码：

  public string GetDismOutput()
  {
        string Output = null;
        string SxsPath = "D:\\Sources\\sxs";
        string CmdParm = "/online /enable-feature /featurename:NetFX3 /All /Source:\"";
        ProcessStartInfo Pinf = new ProcessStartInfo {FileName = SxsPath, Arguments = CmdParm + SxsPath + "\" /LimitAccess"};
        Process Prc = null;
        try
        {
            Pinf.UseShellExecute = false;
            Pinf.RedirectStandardOutput = true;
            Prc = Process.Start(Pinf);
            Prc.WaitForExit(20 * 60 * 1000); //' Wait for 20 Minutes
            CmdParm = Prc.StandardOutput.ReadToEnd();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        return Output;
    }

其中D：\ Sources \ sxs是sxs文件夹的路径。输出字符串将类似于：

Deployment Image Servicing and Management tool
Version: 6.3.9600.17031
Image Version: 6.3.9600.17031
Enabling feature(s)
The operation completed successfully.