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/// <summary>
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/// 缩放图片
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/// </summary>
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/// <param name="source">处理源</param>
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/// <param name="output">输出</param>
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/// <param name="times">倍数</param>
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/// <returns>表示操作是否成功</returns>
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private bool GetMicroImage(Image source, out Image output, int times)
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{
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    try
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    {
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        output = source.GetThumbnailImage(source.Width * times, source.Height * times , () => false, IntPtr.Zero);
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        return true;
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    }
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    catch
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    {
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        output = source;
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        return false;
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    }
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}