[英]Generic method for setting string enum converter in EF Core for all entities
I'm trying to set String-Enum value converter to all enum
properties of all entities in my EF Core Code-First project.我正在尝试将字符串枚举值转换器设置为我的 EF Core Code-First 项目中所有实体的所有
enum
属性。
I can do this manually like this:我可以像这样手动执行此操作:
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
// Do this for every single enum property in each of the entities
modelBuilder.Entity<MyEntity>().Property(e => e.MyEnum).HasConversion<string>();
}
But I'm looking for a generic way of doing this for all properties using an extension method.但我正在寻找一种使用扩展方法为所有属性执行此操作的通用方法。 I tried using the below code, but I'm getting the following error:
我尝试使用以下代码,但出现以下错误:
Converter for model type 'object' cannot be used for 'MyEnum'
model 类型“对象”的转换器不能用于“MyEnum”
public static void SetEnumStringConverter(this ModelBuilder modelBuilder)
{
var properties = modelBuilder?.Model.GetEntityTypes().SelectMany(x => x.GetProperties().Where(y => typeof(Enum).IsAssignableFrom(y.ClrType)));
foreach (var property in properties)
{
property.SetValueConverter(new ValueConverter<object, string>(v => v.ToString(), v => (object)Enum.Parse(property.ClrType, v)));
}
}
Also tried the following, gives me the same error还尝试了以下,给了我同样的错误
property.SetValueConverter(new ValueConverter<Enum, string>(v => v.ToString(), v => Enum.Parse(property.ClrType, v)));
Obviously because enum is not an object?显然是因为枚举不是 object?
Nevertheless, is there any other way of doing this in a generic way?然而,有没有其他方法可以通用的方式做到这一点?
So, after a little digging, I found a way to achieve this.所以,经过一番挖掘,我找到了实现这一目标的方法。 Though not straightforward, gets the desired result.
虽然不简单,但得到了想要的结果。
public static void SetEnumStringConverter(this ModelBuilder modelBuilder)
{
foreach (var entityType in modelBuilder?.Model.GetEntityTypes())
{
var entityBuilder = modelBuilder.Entity(entityType.ClrType);
foreach (var property in entityType.GetProperties())
{
if (typeof(Enum).IsAssignableFrom(property.ClrType))
{
entityBuilder.Property(property.ClrType, property.Name).HasConversion<string>();
}
}
}
}
You can simply use SetProviderClrType extension method, eg您可以简单地使用SetProviderClrType扩展方法,例如
public static void SetEnumStringConverter(this ModelBuilder modelBuilder)
{
var properties = modelBuilder.Model.GetEntityTypes()
.SelectMany(e => e.GetProperties())
.Where(p => (Nullable.GetUnderlyingType(p.ClrType) ?? p.ClrType).IsEnum);
foreach (var property in properties)
property.SetProviderClrType(typeof(string)); // <--
}
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