I get this exception when I try to insert a DBNull.Value into a nullable varbinary(max) field:
Implicit conversion from data type nvarchar to varbinary(max) is not allowed. Use the CONVERT function to run this query.
Thats my code:
insertCMD.Parameters.AddWithValue("@ErrorScreenshot", SqlDbType.VarBinary).Value = DBNull.Value;
I know there exist duplicate questions on SO, but I do NOT use any String like the others do.
What do I wrong?
UPDATE:
using (var insertCMD = new SqlCommand("INSERT INTO TestplanTeststep (TeststepId,TestplanId,CreatedAt,ErrorText,ErrorScreenshot,TestState) VALUES (@TeststepId, @TestplanId,@CreatedAt,@ErrorText,@ErrorScreenshot,@TestState)", con))
{
var p1 = insertCMD.Parameters.Add("@TeststepId", SqlDbType.Int);
var p2 = insertCMD.Parameters.Add("@CreatedAt", SqlDbType.DateTime);
insertCMD.Parameters.AddWithValue("@TestplanId", testplan.Id);
insertCMD.Parameters.AddWithValue("@ErrorText", (object) DBNull.Value);
insertCMD.Parameters.AddWithValue("@ErrorScreenshot", (object) DBNull.Value);
insertCMD.Parameters.AddWithValue("@TestState", (int)Teststep.TeststepTestState.Untested);
foreach (Teststep step in teststeps)
{
p1.Value = step.Id;
p2.Value = step.CreatedAt;
insertCMD.ExecuteNonQuery();
}
}