我知道這已經(jīng)得到了解答，但我有類似的要求，所以我掀起了一些擴(kuò)展方法來做到這一點(diǎn) . 適用于Files，FileStreams，MemoryStreams和通用Streams . 僅讀取驗(yàn)證文件類型所需的特定4個(gè)字節(jié) . 非常高效，我能夠在幾秒鐘內(nèi)完成數(shù)千個(gè)文件 .

C#

public static class Dicom

{

public static bool IsDicomFile(this Stream s)

{

//Create an empty 4 byte array

byte[] dba = new byte[4];

//Seek to 0x80

s.Seek(128, SeekOrigin.Begin);

//Read the following 4 dba

s.Read(dba, 0, 4);

//Compare to 'DICM'

return dba.SequenceEqual(new byte[4] {68, 73, 67, 77});

}

public static bool IsDicomFile(this MemoryStream ms)

{

return ((Stream)ms).IsDicomFile();

}

public static bool IsDicomFile(this FileStream fs)

{

return ((Stream)fs).IsDicomFile();

}

public static bool IsDicomFile(this FileInfo fi)

{

return fi.OpenRead().IsDicomFile();

}

}

VB.NET

_

Public Function IsDicomFile(ByVal s As Stream) As Boolean

'Create an empty 4 byte array

Dim dba() As Byte = New Byte(3) {}

'Seek to 0x80

s.Seek(128, SeekOrigin.Begin)

'Read the subsequent 4 bytes

s.Read(dba, 0, 4)

'Compare to 'DICM'

Return dba.SequenceEqual(New Byte(3) {68, 73, 67, 77})

End Function

_

Public Function IsDicomFile(ByVal ms As MemoryStream) As Boolean

Return DirectCast(ms, Stream).IsDicomFile

End Function

_

Public Function IsDicomFile(ByVal fs As FileStream) As Boolean

Return DirectCast(fs, Stream).IsDicomFile

End Function

_

Public Function IsDicomFile(ByVal fi As FileInfo) As Boolean

Return fi.OpenRead().IsDicomFile

End Function

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