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c#sql-server-2008bytevarbinarymax
ePezhman
ePezhman

Reputation: 4010

Retrieve varbinary(MAX) from SQL Server to byte[] in C#

I'm trying to get a varbinary(MAX) from SQL Server to a byte[] variable in C#.

How can I do this?

Thanks

Upvotes: 16

Views: 31454

Answers (2)

DiSaSteR
DiSaSteR

Reputation: 636

You have to SELECT DATALENGTH(data) and data

where data is your varbinary(max)

int i=0;
long dataLen = dr.GetInt64(i++);
if (dataLen > 0)
{
    Data = new byte[dataLen];
    dr.GetBytes(i++, 0, Data, 0, (int)dataLen);
}

Upvotes: 1

Rubens Farias
Rubens Farias

Reputation: 57946

private static byte[] getDocument(int documentId)
{
    using (SqlConnection cn = new SqlConnection("..."))
    using (SqlCommand cm = cn.CreateCommand())
    {
        cm.CommandText = @"
            SELECT DocumentData
            FROM   Document
            WHERE  DocumentId = @Id";
        cm.Parameters.AddWithValue("@Id", documentId);
        cn.Open();
        return cm.ExecuteScalar() as byte[];
    }
}

Upvotes: 28

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