Support [Bind] attribute for compatibility with MVC5

[Praburaj]

In MVC 5 we have the ability to specify [Bind(Include = "comma separated field names")].

Right now [BindRequired] or [BindNever] needs to be set at property level.

[yishaigalatzer]

We should add the Bind attribute, but we should make sure our samples use nameof()

e.g. [Bind(Include = nameof(Prop1) + "," + nameof(Prop2)]

[yishaigalatzer]

@harshgMSFT

[harshgMSFT]

Adding some more context about the bug:

Bind Attribute

1. Can be specified at class or parameter level.
2. It defines three properties :
   a. Include: Can be used to selectively include properties.Is applicable for parameters and types.
   b. Exclude: Can be used to selectively exclude the properties.Is applicable for parameters and types.
   c. Prefix : Only applicable if this attribute is decorating a parameter.

2.a and 2.b can be achieved using the
[BindRequired] and [BindNever] attribute by defining them directly on the properties or on the Type definition.
Gaps:

1. Bind Required and Bind Never cannot be annotated on Parameters.
2. There is no way to provide prefix value for the parameters.
3. [BindRequired] and [BindNever] do validation as well. Historically this was to prevent under binding ( i.e to ensure that the model has a user provided value and not a default value).

• Given the above use cases, except for the addition of prefix, I don't see much value in having a Bind attribute along with a BindRequired and BindNever attributes. The prefix part also needs to be solved for Model-binding : Support data annotation based property names for data coming from Url too #925 and that should not be solved using the bind attribute.

[rynowak]

Resolved by: 5405e3b761ad8c55f8fbd1ef311454342568860

[harshgMSFT]

75405e3