Question

I am trying to fill a treeview in WPF with icons of files and folders, just like Windows Explorer does. The problem is, that it is very slow to load, because I am using a converter that just calls

return Imaging.CreateBitmapSourceFromHIcon(icon.Handle, new Int32Rect(0, 0, c.Width, c.Height), BitmapSizeOptions.FromEmptyOptions());

我认为,这为我收到的每份档案/文件创造了新的一席。我用<代码>ManagedWinAPI的延伸检索图像。因此,我现在正计划使用一种可相互比较的理论。

But how can I compare two System.Drawing.Icon objects? Because the reference is always different (tested). I don t need a pixel comparator, because I don t think that will speed up my process.

<>Update>

考虑到@Roy Dictus,该名词典仍然告诉我,名单上没有相同的物体:

Dictionary<byte[], ImageSource> data = new Dictionary<byte[], ImageSource>();

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    Icon c = (Icon)value;
    Bitmap bmp = c.ToBitmap();

    // hash the icon
    ImageConverter converter = new ImageConverter();
    byte[] rawIcon = converter.ConvertTo(bmp, typeof(byte[])) as byte[];

    MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
    byte[] hash = md5.ComputeHash(rawIcon);

    ImageSource result;

    data.TryGetValue(hash, out result);

    if (result == null)
    {
        PrintByteArray(hash); // custom method, prints the same values for two folder icons
        result = Imaging.CreateBitmapSourceFromHIcon(c.Handle, new Int32Rect(0, 0, c.Width, c.Height), BitmapSizeOptions.FromEmptyOptions());
        data.Add(hash, result);
    }
    else
    {
        Console.WriteLine("Found equal icons");
    }

    return result;
}

Answer 1

你们要么要比较比照图,要么根据比照图计算面值,然后比较这些数值。

这个关于视觉C# Kicks的员额显示,你如何从光标中计算出一个厚值。

EDIT: Some extra information based on how OP modified his question:

我肯定不会执行《公约》。如果你能够将星座转换成一个能够执行可混合的护卫,那么它很可能会发挥作用。

你们可以把一阵列变成一个这样的阵列:

StringBuilder sb = new StringBuilder();
for (int i = 0; i < result.Length; i++)
{
    sb.Append(result[i].ToString("X2"));
}

Answer 2

使用<代码>。 Handle as dictionary key.

友情链接