我正在为 View 模型创建自定义模型绑定(bind)器,实现 IModelBinder
我的 View 模型中有很多属性,其中大部分不需要任何自定义绑定(bind)。而不是从 ModelBindingContext
单独显式设置我的模型上的所有属性值,我将能够让框架为我绑定(bind)模型,然后我将执行任何自定义绑定(bind):
public class ApplicationViewModelBinder : IModelBinder
{
public Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
// get .net core to bind values on model
// Cary out any customization of the models properties
bindingContext.Result = ModelBindingResult.Success(bindingContext.Model);
return Task.CompletedTask;
}
}
基本上我想执行默认模型绑定(bind),然后应用自定义绑定(bind),类似于此 SO post 中采用的方法但对于 .NET Core,而不是框架。
我认为应用默认绑定(bind)会很简单,但无法找到如何做到这一点。我相信解决方案将涉及
ComplexTypeModelBinder
和 ComplexTypeModelBinderProvider
类(class),但似乎无法找到如何去做。我知道当 POST 请求到达我的 Controller 方法时我可以进行任何更改,但这似乎是错误的地方和错误的时间。
最佳答案
定制ComplexTypeModelBinder
,您可以从 ComplexTypeModelBinder
继承.
public class BinderModel
{
public int Id { get; set; }
public string Name { get; set; }
public string BinderValue { get; set; }
}
[HttpPost]
public void Post([FromForm]BinderModel value)
{
}
public class CustomBinder : ComplexTypeModelBinder
{
private readonly IDictionary<ModelMetadata, IModelBinder> _propertyBinders;
public CustomBinder(IDictionary<ModelMetadata, IModelBinder> propertyBinders)
: base(propertyBinders)
{
_propertyBinders = propertyBinders;
}
protected override Task BindProperty(ModelBindingContext bindingContext)
{
if (bindingContext.FieldName == "BinderValue")
{
bindingContext.Result = ModelBindingResult.Success("BinderValueTest");
return Task.CompletedTask;
}
else
{
return base.BindProperty(bindingContext);
}
}
protected override void SetProperty(ModelBindingContext bindingContext, string modelName, ModelMetadata propertyMetadata, ModelBindingResult result)
{
base.SetProperty(bindingContext, modelName, propertyMetadata, result);
}
}
public class CustomBinderProvider : IModelBinderProvider
{
public IModelBinder GetBinder(ModelBinderProviderContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.Metadata.IsComplexType && !context.Metadata.IsCollectionType)
{
var propertyBinders = new Dictionary<ModelMetadata, IModelBinder>();
for (var i = 0; i < context.Metadata.Properties.Count; i++)
{
var property = context.Metadata.Properties[i];
propertyBinders.Add(property, context.CreateBinder(property));
}
//var loggerFactory = context.Services.GetRequiredService<ILoggerFactory>();
//return new ComplexTypeModelBinder(propertyBinders, loggerFactory);
return new CustomBinder(propertyBinders);
}
return null;
}
}
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc(options => {
options.ModelBinderProviders.Insert(0, new CustomBinderProvider());
});
}
关于asp.net-core - .NET 核心自定义和默认绑定(bind)相结合,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51921074/