Convert byte[] or object to GUID

Question

I assigned some value to object data type like,

object objData =dc.GetDirectoryEntry().Properties[\"objectGUID\"].Value;

this object retun the

Answer 1

The System.DirectoryServices.DirectoryEntry class has the property Guid for this purpose - no need to access the objectGUID attribute through Properties.

Answer 2

Though the manual casting suggested above works, there's a way to do this automatically.

1. You can use the official SQLite provider instead of the one from Microsoft. Use its SQLiteConnectionStringBuilder to configure a Connection that understands your Guids as Guids:

var builder = new SQLiteConnectionStringBuilder("Data Source=./mydatabase.db") { BinaryGUID = true };
var connStr = builder.ToString();
return new SQLiteConnection(connStr);

Here's the official SQLite provider: https://www.nuget.org/packages/System.Data.SQLite.Core/

2. If using Dapper, you can have it automatically convert byte arrays to Guid using this class, which should be registered once as soon as your app starts:

public class GuidTypeHandler : SqlMapper.TypeHandler<Guid>
{
    public override Guid Parse(object value)
    {
        var valueAsBytes = (byte[])value;
        return new Guid(valueAsBytes);
    }

    public override void SetValue(System.Data.IDbDataParameter parameter, Guid value)
    {
        var guidAsBytes = value.ToByteArray();
        parameter.Value = guidAsBytes;
    }
}

// And the registration in Startup.cs or equivalent:
SqlMapper.AddTypeHandler<Guid>(new GuidTypeHandler());

Source: Dapper Issue #718 - GitHub

Answer 3

How about using the Guid constructor which takes a byte array?

Guid guid = new Guid(binaryData);

(You can then use Guid.ToString() to get it in text form if you need to.)

Answer 4

byte[] binaryData = objData as byte[];
string strHex = BitConverter.ToString(binaryData);
Guid id = new Guid(strHex.Replace("-", ""))

Answer 5

The long form would be (enter link description here):

public static string ConvertGuidToOctectString(string objectGuid)
{
    System.Guid guid = new Guid(objectGuid);
    byte[] byteGuid = guid.ToByteArray();
    string queryGuid = "";
    foreach (byte b in byteGuid)
    {
        queryGuid += @"\" + b.ToString("x2");
    }
    return queryGuid;
}