GetMediaItemUrl扩展方法似乎可以为您提供所需的内容.

The GetMediaItemUrl extension method seems to give you what you want.

public static class ItemExtensions
{
    public static string GetMediaItemUrl(this Item item)
    {
        var mediaUrlOptions = new MediaUrlOptions() { UseItemPath = false, AbsolutePath = true };
        return Sitecore.Resources.Media.MediaManager.GetMediaUrl(item, mediaUrlOptions);
    }
}

[TestFixture]
public class when_using_items_extensions
{
    [Test]
    public void a_url_based_on_media_item_id_can_be_generated()
    {
        // Arrange
        Database db = global::Sitecore.Configuration.Factory.GetDatabase("master");
        Item item = db.GetItem("/sitecore/media library/Images/MyImage");

        // Act
        var mediaUrl = item.GetMediaItemUrl();

        // Assert
        Assert.That(mediaUrl, Is.EqualTo("/~/media/17A1341ABEEC46788F2159843DCEAB03.ashx"));
    }
}