[英]ASP.Net Core 6 HttpGet API ==> How to bind [FromQuery] parameter to C# object data type
[英]How to use DataMember Name for [FromQuery] object Asp.Net core, ModelBinding
对于 [FromBody] 参数,我可以使用DataMember.Name来设置属性的自定义名称,但它不适用于 [FromQuery]。 我想这取决于模型绑定
我想处理像?status=a&status=b&status=c
带有查询对象[FromQuery]MyQuery
[DataContract]
class MyQuery {
[DataMember(Name = "status")
public IReadOnlyList<string> Statuses { get; set; }
}
我可以这样做
class MyQuery {
[FromQuery("status")
public IReadOnlyList<string> Statuses { get; set; }
}
但我想避免来自AspNetCore
模型依赖,有什么解决方案吗?
(有关于 Web API 2 的类似问题,但没有回答)
我没有找到使用标准属性的方法,所以我使用statuses
名称,将自定义属性用于字符串集合
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
internal class StringCollectionAttribute : Attribute
{
}
并使用自定义模型绑定器
public class StringCollectionBinderProvider : IModelBinderProvider
{
private static readonly Type BinderType = typeof(StringCollectionBinder);
private static readonly Type ModelType = typeof(List<string>);
public IModelBinder GetBinder(ModelBinderProviderContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
var propertyAttributes = (context.Metadata as DefaultModelMetadata)?.Attributes.PropertyAttributes;
var isStringCollection =
propertyAttributes?.Any(x => x is StringCollectionAttribute) == true
&& context.Metadata.ModelType.IsAssignableFrom(ModelType);
return isStringCollection ? new BinderTypeModelBinder(BinderType) : null;
}
}
public class StringCollectionBinder : IModelBinder
{
private const char ValueSeparator = ',';
public Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
var modelName = bindingContext.ModelName;
var valueCollection = bindingContext.ValueProvider.GetValue(modelName);
if (valueCollection == ValueProviderResult.None)
{
return Task.CompletedTask;
}
bindingContext.ModelState.SetModelValue(modelName, valueCollection);
var stringCollection = valueCollection.FirstValue;
if (string.IsNullOrEmpty(stringCollection))
{
return Task.CompletedTask;
}
var collection = stringCollection.Split(ValueSeparator).ToList();
bindingContext.Result = ModelBindingResult.Success(collection);
return Task.CompletedTask;
}
}
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