无法将参数值从字符串转换为int64

Question

I'm getting an error : Failed to convert parameter from string to Int 64 here is the ligne :

com.Parameters.Add("@NBC", SqlDbType.BigInt).Value = ligneGridBC1.Cells["NBcmd"].ToString();

I already tried

com.Parameters.Add("@NBC", SqlDbType.BigInt).Value = Convert.ToInt64(ligneGridBC1.Cells["NBcmd"].ToString());

com.Parameters.Add("@NBC", SqlDbType.BigInt).Value = Int64.Parse(ligneGridBC1.Cells["NBcmd"].ToString()); 

My sql table contains NBC BigInt Any help would be appreciated.

Answer 1

What type of object does ligneGridDC1.Cells["NBcmd"] contain?

Calling .ToString() on an object will by default return the type of object, unless the ToString method has been overridden. you're trying to convert 'SomeType.Cell' to a Int64.

Try this...

        Int64 a = 0;
        if(!Int64.TryParse(ligneGridBC1.Cells["NBcmd"].ToString(), out a))
            throw new InvalidCastException(ligneGridBC1.Cells["NBcmd"].ToString());
        com.Parameters.Add("@NBC", SqlDbType.BigInt).Value = a;

Hope that helps