Create Extension Method to Produce Open & Closing Tags like Html.BeginForm()

前端未结

关注

 1  983

遥遥无期 2020-12-30 10:07

I wonder if it\'s possible to create an extension method which has functionality & behaviour similar to Html.BeginForm(), in that it would generate a complete Html tag,

1条回答

暗喜 (楼主)

2020-12-30 10:24
Not quite sure how much value this has over simply defining a
element, but something like so
```
/// 
/// Represents a HTML div in an Mvc View
/// 
public class MvcDiv : IDisposable
{
    private bool _disposed;
    private readonly ViewContext _viewContext;
    private readonly TextWriter _writer;

    /// 
    /// Initializes a new instance of the  class.
    /// 
    /// The view context.
    public MvcDiv(ViewContext viewContext) {
        if (viewContext == null) {
            throw new ArgumentNullException("viewContext");
        }
        _viewContext = viewContext;
        _writer = viewContext.Writer;
    }

    /// 
    /// Performs application-defined tasks associated with 
    /// freeing, releasing, or resetting unmanaged resources.
    /// 
    public void Dispose()
    {
        Dispose(true /* disposing */);
        GC.SuppressFinalize(this);
    }

    /// 
    /// Releases unmanaged and - optionally - managed resources
    /// 
    /// true to release both 
    /// managed and unmanaged resources; false 
    /// to release only unmanaged resources.
    protected virtual void Dispose(bool disposing)
    {
        if (!_disposed)
        {
            _disposed = true;
            _writer.Write("
```
"); } } /// /// Ends the div. /// public void EndDiv() { Dispose(true); } } /// /// HtmlHelper Extension methods for building a div /// public static class DivExtensions { /// /// Begins the div. /// /// The HTML helper. /// public static MvcDiv BeginDiv(this HtmlHelper htmlHelper) { // generates ... > return DivHelper(htmlHelper, null); } /// /// Begins the div. /// /// The HTML helper. /// The HTML attributes. /// public static MvcDiv BeginDiv(this HtmlHelper htmlHelper, IDictionary htmlAttributes) { // generates ... > return DivHelper(htmlHelper, htmlAttributes); } /// /// Ends the div. /// /// The HTML helper. public static void EndDiv(this HtmlHelper htmlHelper) { htmlHelper.ViewContext.Writer.Write("
"); } /// /// Helps build a html div element /// /// The HTML helper. /// The HTML attributes. /// private static MvcDiv DivHelper(this HtmlHelper htmlHelper, IDictionary htmlAttributes) { TagBuilder tagBuilder = new TagBuilder("div"); tagBuilder.MergeAttributes(htmlAttributes); htmlHelper.ViewContext.Writer.Write(tagBuilder.ToString(TagRenderMode.StartTag)); MvcDiv div = new MvcDiv(htmlHelper.ViewContext); return div; } }
and use like so
```
<% using (Html.BeginDiv(new Dictionary{{"class","stripey"}}))
{ %>
       Content Here
<% } %>
```
will render
```
    Content Here
```
or without html attributes
```
<% using (Html.BeginDiv())
{ %>
       Content Here
<% } %>
```

0 讨论(0)