如何使用 Entity Framework 4.1“仅代码"映射 char 属性?流畅的API? [英] How do I map a char property using the Entity Framework 4.1 "code only" fluent API?

问题描述

我有一个具有 char 属性的对象:

I have an object that has a char property:

public class Product
{
    public char Code
    {
        get;
        set;
    }
}

Entity Framework 似乎无法映射字符(当我从模型对象创建数据库架构时，数据库中缺少此字段).无论如何我可以使用流利的 API 映射字符(例如到字符串)吗?我不想更改模型对象，因为它们是旧共享库的一部分.

Entity Framework doesn't seem to be able to map chars (this field is missing from the database when I create the database schema from my model objects). Is there anyway I can map the char (e.g. to a string) using the fluent API? I don't want to change the model objects as they are part of a legacy shared library.

推荐答案

Char 不是实体框架的有效原始类型 = 实体框架没有映射它.如果您检查 CSDL 参考，您将看到有效类型列表(char 不在其中).

Char is not valid primitive type for entity framework = entity framework doesn't map it. If you check CSDL reference you will see list of valid types (char is not among them).

数据库 char(1) 被翻译为 string (SQL 到 CSDL 的转换).Char 被描述为 固定长度为1的非unicode字符串.

Database char(1) is translated as string (SQL to CSDL translation). Char is described as non-unicode string with fixed length 1.

唯一丑陋的选择是使用字符串的第二个映射属性，而您的 char 非映射属性将只使用该属性中的 string[0].这只是 EF 中缺少一些简单类型映射或转换器的另一个示例.

The only ugly option is second mapped property using string and your char non-mapped property will just use string[0] from that property. That is just another example how some simple type mapping or converters are damn missing in EF.

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