C# 判断两张图片是否一致的快速方法

#region 判断图片是否一致 
///
<summary> 
/// 判断图片是否一致 
///
</summary> 
/// <param
name="img">图片一</param> 
/// <param
name="bmp">图片二</param> 
///
<returns>是否一致</returns> 
public bool
IsSameImg(Bitmap img, Bitmap
bmp) 
{ 
//大小一致 
if
(img.Width == bmp.Width && img.Height ==
bmp.Height) 
{ 
//将图片一锁定到内存 
BitmapData
imgData_i = img.LockBits(new Rectangle(0, 0, img.Width, img.Height),
ImageLockMode.ReadOnly,
PixelFormat.Format24bppRgb); 
IntPtr ipr_i =
imgData_i.Scan0; 
int length_i = imgData_i.Width *
imgData_i.Height * 3; 
byte[] imgValue_i = new
byte[length_i]; 
Marshal.Copy(ipr_i, imgValue_i, 0,
length_i); 
img.UnlockBits(imgData_i); 
//将图片二锁定到内存 
BitmapData
imgData_b = img.LockBits(new Rectangle(0, 0, img.Width, img.Height),
ImageLockMode.ReadOnly,
PixelFormat.Format24bppRgb); 
IntPtr ipr_b =
imgData_b.Scan0; 
int length_b = imgData_b.Width *
imgData_b.Height * 3; 
byte[] imgValue_b = new
byte[length_b]; 
Marshal.Copy(ipr_b, imgValue_b, 0,
length_b); 
img.UnlockBits(imgData_b); 
//长度不相同 
if
(length_i != length_b) 
{ 
return
false; 
} 
else 
{ 
//循环判断值 
for
(int i = 0; i < length_i;
i++) 
{ 
//不一致 
if
(imgValue_i[i] !=
imgValue_b[i]) 
{ 
return
false; 
} 
} 
return
true; 
} 
} 
else 
{ 
return
false; 
} 
} 
#endregion

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