Where is HtmlEncode in Asp.NET 5

问题:

I have a custom IHtmlHelper extension method that uses TagBuilder and returns an HtmlString. I can no longer pass tagBuiler.ToString() to the HtmlString constructor as that just returns the typename now.

I see I can use the tabBuiler.WriteTo(TextWriter, IHtmlEncoder) method but I don't know exactly how to get my hands on an object that implments IHtmlEncoder. I see encoders in both System.Text.Encodings.Web and Microsoft.Framework.WebEncoders. But the types in the two namespace don't seem to play well together.

回答1:

HtmlEncoder in Microsoft.Extensions.WebEncoders.Core is just a wrapper around System.Text.Encodings.Web.HtmlEncoder to implement IHtmlEncoder interface (https://github.com/aspnet/HttpAbstractions/blob/release/src/Microsoft.Extensions.WebEncoders.Core/HtmlEncoder.cs).

You can take Microsoft.Extensions.WebEncoders.HtmlEncoder.Default and pass to WriteTo method.

From what I see in dev branch MVC moved to using System.Text.Encodings.Web.HtmlEncoder directly so you wan't need to use Microsoft.Extensions.WebEncoders.HtmlEncoder anymore in future.

回答2:

In ASP.NET Core RC2 you can find HtmlDecode in System.Net.WebUtility:

• GitHub source of System.Net.WebUtility

In your project.json import dependency system.net.utilities

"dependencies": {
    "System.Text.Encodings.Web": "4.0.0-rc2-24027"
}

回答3:

As for RC1 update 1, here is how it is done:

using System.Text.Encodings.Web;

...

HtmlEncoder.Default.Encode("...");

回答4:

Just use System.Net.WebUtility.HtmlEncode or decode as:

System.Net.WebUtility.HtmlEncode() System.Net.WebUtility.HtmlDecode()