崩溃时如何使用ChromiumWebBrowser [英] How can I use a ChromiumWebBrowser when Collapsed

问题描述

我有一个 ChromiumWebBrowser 控件，其 Visibility 为 Collapsed .在将可见性设置为 Visible 之前，页面不会加载，并且许多呼叫失败:

System.Exception :浏览器尚未初始化. Load 只能在底层CEF浏览器初始化后才能调用( CefLifeSpanHandler :: OnAfterCreated ).

当 Visibility 被折叠时，如何加载页面?

解决方案

创建 ChromiumWebBrowser 的子类，如 解决方案

Create a subclass of ChromiumWebBrowser as described in Render problems when Initial Visibility Collapsed. To work around a NullReferenceException in AbstractRenderHandler.OnPaint, you will need to ensure the visual tree is already created (by calling ApplyTemplate).

Example:

internal sealed class CollapsableChromiumWebBrowser : ChromiumWebBrowser
{
    public CollapsableChromiumWebBrowser()
    {
        this.Loaded += this.CollapsableChromiumWebBrowser_Loaded;
    }

    private void CollapsableChromiumWebBrowser_Loaded(object sender, System.Windows.RoutedEventArgs e)
    {
        // Avoid loading CEF in designer
        if (DesignerProperties.GetIsInDesignMode(this))
        {
            return;
        }

        // Avoid NRE in AbstractRenderHandler.OnPaint
        ApplyTemplate();
        // https://github.com/cefsharp/CefSharp/issues/1412
        CreateOffscreenBrowser(new Size(400, 400));
    }
}

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