C# WinForms 4.7.8录屏APP：如何在RecorderOptions中添加全屏忽略SourceRect的条件

针对你的需求，这里提供两种符合C# WinForms 4.7.8的实现方式，核心逻辑是全屏录制时跳过SourceRect赋值，非全屏时使用指定区域：

方式一：对象初始化器内用三元运算符（适用于SourceRect支持可空类型的场景） #

直接在对象初始化时通过三元表达式完成条件赋值，代码更紧凑：

RecorderOptions options = new RecorderOptions
{
    AudioOptions = new AudioOptions
    {
        IsAudioEnabled = true,
        IsOutputDeviceEnabled = SpeakersOn,
        IsInputDeviceEnabled = MicrophoneOn,
        AudioOutputDevice = selectedOutputDevice.DeviceName,
        AudioInputDevice = selectedInputDevice.DeviceName,
        InputVolume = 1,
        OutputVolume = 1,
    },
    OutputOptions = new OutputOptions
    {
        RecorderMode = RecorderMode.Video,
        OutputFrameSize = new ScreenSize(1920, 1080),
        Stretch = StretchMode.Uniform,
        // 核心逻辑：非全屏时赋值指定区域，全屏时设为null（框架会自动忽略并使用全屏）
        SourceRect = RecordFullscreen ? null : new ScreenRect(this.Left + 15, this.Top + 35, this.Width - 30, this.Height - 50)
    },
};

方式二：分步初始化（适用于SourceRect不支持可空的场景） #

如果你的录屏框架要求SourceRect必须为非空值，可先初始化基础配置，再根据条件赋值：

// 先初始化OutputOptions的基础参数
var outputOptions = new OutputOptions
{
    RecorderMode = RecorderMode.Video,
    OutputFrameSize = new ScreenSize(1920, 1080),
    Stretch = StretchMode.Uniform
};

// 仅在非全屏模式下设置SourceRect
if (!RecordFullscreen)
{
    outputOptions.SourceRect = new ScreenRect(this.Left + 15, this.Top + 35, this.Width - 30, this.Height - 50);
}

// 组装最终的RecorderOptions
RecorderOptions options = new RecorderOptions
{
    AudioOptions = new AudioOptions
    {
        IsAudioEnabled = true,
        IsOutputDeviceEnabled = SpeakersOn,
        IsInputDeviceEnabled = MicrophoneOn,
        AudioOutputDevice = selectedOutputDevice.DeviceName,
        AudioInputDevice = selectedInputDevice.DeviceName,
        InputVolume = 1,
        OutputVolume = 1,
    },
    OutputOptions = outputOptions
};

逻辑说明 #

• 当RecordFullscreen为true时，不设置/清空SourceRect，录屏框架会自动触发全屏录制逻辑
• 当RecordFullscreen为false时，使用你定义的窗口内区域（偏移15/35像素，去除边框后的区域）

内容的提问来源于stack exchange，提问作者user2180706