I get the result in .NET like this:
var lastRowVersion = SqlHelper.ExecuteScalar(connStr, CommandType.Text, "select
top 1 rowversion from dbo.sdb_x_orginfo order by rowversion desc");
The result is a byte array [0]= 0,[1]=0,[2]=0,[3]=0,[4]=0,[5]=0,[6]=30,[7]=138, but the result in SQL Server is 0x0000000000001E8A.
How can I get the value "0x0000000000001E8A" in .NET?
I found that the byte[] returned from sql server had the wrong Endian-ness and hence the conversion to long (Int64) did not work correctly. I solved the issue by calling Reverse on the array before passing it into BitConverter:
byte[] byteArray = {0, 0, 0, 0, 0, 0, 0, 8};
var value = BitConverter.ToUInt64(byteArray.Reverse().ToArray(), 0);
Also, I thought it better to convert to UInt64.
If you just want to convert byte[] to a System.Int64 (aka long) then use BitConverter.ToInt64:
SqlBinary binary = /* ... */;
long value = BitConverter.ToInt64(binary.Value, 0); // 0 is the start index in the byte array
To display it as a hex string, you can use the X format specifier, e.g.:
Console.WriteLine("Value is 0x{0:X}.", value);
Here's an one-liner:
var byteArray = new byte[] { 0, 0, 0, 0, 0, 0, 30, 138 };
var rowVersion = "0x" + string.Concat(Array.ConvertAll(byteArray, x => x.ToString("X2")));
The result is:
"0x0000000000001E8A"
Just be aware that there are other options that perform better.
You can use following query which will return bigint instead of returning hex.
select top 1 cast(rowversion as bigint) rowversion from dbo.sdb_x_orginfo order by rowversion desc
Same as "Ashish Singh" I returned to c# after converting to bigint on DB and used Int64 on the code side. Converting to long/Int64/UInt64 in c#/VB gave wrong results.(even after reversing the array because of the little endian issue.)
Pay attention on the DB side that RowVersion timestamp has MIN_ACTIVE_ROWVERSION() which indicates the last commited timestamp
Works fine for me
var versionString = new StringBuilder();
versionString.Append("0x");
for (var i = 0; i < binary.Count(); i++)
{
versionString.Append(string.Format("{0:X}", binary[i]));
}
versionString.ToString(); // result
