Debug IronPython in visual studio code (vscode)

launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "IronPython",
            "type": "python",
            "request": "launch",
            "stopOnEntry": true,
            "pythonPath": "C:\\Program Files (x86)\\IronPython 2.7\\ipy.exe",
            "program": "${file}",
            "cwd": "${workspaceRoot}",
            "env": {},
            "envFile": "${workspaceRoot}/.env",
            "debugOptions": [
                "WaitOnAbnormalExit",
                "WaitOnNormalExit",
                "RedirectOutput"
            ]
        },
    ]
}

any way to slove it ? I just can run it ,but when I debugger it ,it will run pass away one moment.