实体框架 - 数据绑定自定义字段出错（未找到属性）

Question

Using Entity Framework, I've extended an entity class with a "display-friendly" version of a property, in this case, CommissionRate which is an entity property and CommissionRateDisplay which is my own custom property. In my bound Web Forms control, I want to display an integer percent 3 but in the database I want to store as a decimal 0.03 .

I've created a custom field in the partial class called CommissionRateDisplay with a get and a set method, as below:

partial class SalesOrder
{
    public double CommissionRateDisplay
    {
        get { return (this.CommissionRate ?? 0) * 100; }
        set { this.CommissionRate = value / 100; }
    }
}

When saving the entity, I'm presented with the following error:

A property named 'CommissionRateDisplay' was not found on the entity during an insert, update, or delete operation. Check to ensure that properties specified as binding expressions are available to the data source.

I'd simply like to bind my custom property and have it persist the modified original in the database. get ting the value works just fine, but set ting does not.

Am I approaching this in the right way, or is there a better way? Apologies if this is a duplicate; I could not find a solution that clearly and succinctly solved the problem.

Answer 1

您需要向自定义属性添加[NotMapped]注释，以使Entity Framework知道您不打算将其作为表中的列。