Question

如何使用cefsharp下载多个文件。

我可以使用此代码下载文件。但我的问题是它只下载第一个链接。如何让cefsharp下载多个文件。

foreach (var item in ListofLinks)
                {
browser.Load(item);
}

//on my form load

browser.DownloadHandler = new MyDownloadHandler();

    class MyDownloadHandler : IDownloadHandler
            {
                public event EventHandler<DownloadItem> OnBeforeDownloadFired;

                public event EventHandler<DownloadItem> OnDownloadUpdatedFired;
                public void OnBeforeDownload(IBrowser browser, DownloadItem downloadItem, IBeforeDownloadCallback callback)
                {
                    var handler = OnBeforeDownloadFired;
                    if (handler != null)
                    {
                        handler(this, downloadItem);
                    }

                    if (!callback.IsDisposed)
                    {
                        using (callback)
                        {
                            callback.Continue(downloadItem.SuggestedFileName, showDialog: true);
                        }
                    }

                }

                public void OnDownloadUpdated(IBrowser browser, DownloadItem downloadItem, IDownloadItemCallback callback)
                {

                    var handler = OnDownloadUpdatedFired;
                    if (handler != null)
                    {
                        handler(this, downloadItem);
                    }

                }
            }

我添加了https://github.com/cefsharp/CefSharp/blob/84930b0784fb8d934af22f4f3cd8a089af6eccf1/CefSharp/IBrowserHost.cs

在我的项目中，我

实现接口

class DownloadMe : IBrowserHost{

}


public void StartDownload(string url)
            {
                //what code do i need here?
            }

Answer 1

我包含以下内容，因为OnBeforeDownloadFired（）的实现未在许多有关如何使用DownloadHandler类的在线示例中显示。

如果下载链接具有目标“_blank”，这有助于解决下载文件（例如.mobi电子书）的唠叨问题。如果没有目标，则会触发下载对话框。使用_blank目标，我不得不在浏览器中禁止弹出窗口并打开一个新的自定义选项卡，但是当发生这种情况时，不会触发下载对话框。

我认为这是对的。希望它有所帮助，或者至少给你一个开始：

DownloadHandler downer = new DownloadHandler(this);
browser.DownloadHandler = downer;
downer.OnBeforeDownloadFired += OnBeforeDownloadFired;
downer.OnDownloadUpdatedFired += OnDownloadUpdatedFired;

private void OnBeforeDownloadFired(object sender, DownloadItem e)
{
    this.UpdateDownloadAction("OnBeforeDownload", e);
}

private void OnDownloadUpdatedFired(object sender, DownloadItem e)
{
    this.UpdateDownloadAction("OnDownloadUpdated", e);
}

private void UpdateDownloadAction(string downloadAction, DownloadItem downloadItem)
{
    /*
    this.Dispatcher.Invoke(() =>
    {
        var viewModel = (BrowserTabViewModel)this.DataContext;
        viewModel.LastDownloadAction = downloadAction;
        viewModel.DownloadItem = downloadItem;
    });
    */
}

// ...

public class DownloadHandler : IDownloadHandler
{
    public event EventHandler<DownloadItem> OnBeforeDownloadFired;

    public event EventHandler<DownloadItem> OnDownloadUpdatedFired;

    MainForm mainForm;

    public DownloadHandler(MainForm form)
    {
        mainForm = form;
    }

// ...

Answer 2

在您的代码中：

foreach (var item in ListofLinks)
                {
browser.Load(item);
}

将其更改为：

foreach (var item in ListofLinks){
var cefBrowser = browser.GetBrowser();
IBrowserHost ibwhost = cefBrowser == null ? null : cefBrowser.GetHost();
ibwhost.StartDownload(item);
}

使用cefsharp下载多个文件

2 个答案: