为什么我在此代码上遇到异常"parameter is not valid"？

Question

private void button8_Click(object sender, EventArgs e)
{
    List<long> averages;
    long res = 0;
    _fi = new DirectoryInfo(subDirectoryName).GetFiles("*.bmp");
    averages = new List<long>(_fi.Length);
    for (int i = 0; i < _fi.Length; i++)
    {
        Bitmap myBitmaps = new Bitmap(_fi[i].Name);
        //long[] tt = list_of_histograms[i];
        long[] HistogramValues = GetHistogram(myBitmaps);
        res = GetTopLumAmount(HistogramValues,1000);
        averages.Add(res);
    }
}

例外情况如下：

Bitmap myBitmaps = new Bitmap(_fi[i].Name);

Answer 1

你只是将文件名传递给Bitmap构造函数，但实际上你应该使用 _fi[i].FullName 传递文件的完整路径

Answer 2

@Lester是正确的

答案(+1(，但我确实想说你可以通过使用一些函数式编程结构来缩短你的实现并使其更具可读性：

var averages = new DirectoryInfo(subDirectoryName)
    .GetFiles("*.bmp")
    .Select(t => new Bitmap(t.FullName))
    .Select(GetHistogram)
    .Select(v => GetTopLumAmount(v, 1000))
    .ToList();

Answer 3

你试过.FullName吗？这应该包括整个目录。