db null进入属性asp.net

Question

i am getting error in the code getting error The value for column 'TotalValue' in table 'wsm_View_PurchaseOrderList' is DBNull.

error image

public decimal TotalValue {
    get {

        try {
            if (object.ReferenceEquals(tablewsm_View_PurchaseOrderList.TotalValueColumn, DBNull.Value)) {
                return 0.0;
            } else {
                return Convert.ToDecimal(this(this.tablewsm_View_PurchaseOrderList.TotalValueColumn));
            }

        } catch (System.InvalidCastException e) {
            throw new global::System.Data.StrongTypingException("The value for column 'TotalValue' in table 'wsm_View_PurchaseOrderList' is DBNull" + ".", e);
        }
    }
    set { this(this.tablewsm_View_PurchaseOrderList.TotalValueColumn) = value; }
}

Answer 1

Try checking for DBNull like this:

if (Convert.IsDBNull(tablewsm_View_PurchaseOrderList.TotalValueColumn))
{
    return 0.0;
}