两者都可以输出一个Partial视图；其区别如下：

1. Partial有返回值(MvcHtmlString)；RenderPartial没有返回值(Void)。

定义

1 //PartialExtensions.Partial 方法 (HtmlHelper, String)

2 public static MvcHtmlString Partial(

3 this HtmlHelper htmlHelper,

4 string partialViewName

5 )

6

7 //RenderPartialExtensions.RenderPartial 方法 (HtmlHelper, String)

8 public static void RenderPartial(

9 this HtmlHelper htmlHelper,

10 string partialViewName

11 )

2. Partial输出到临时变量 ；RenderPartial输出到..上（即直接输出到Response)。

Html.Partial内部实现

public static MvcHtmlString Partial(this HtmlHelper htmlHelper, string partialViewName)

{

return htmlHelper.Partial(partialViewName, null, htmlHelper.ViewData);

}

public static MvcHtmlString Partial(this HtmlHelper htmlHelper, string partialViewName, object model, ViewDataDictionary viewData)

{

using (StringWriter writer = new StringWriter(CultureInfo.CurrentCulture))

    {

        htmlHelper.RenderPartialInternal(partialViewName, viewData, model, writer, ViewEngines.Engines);

return MvcHtmlString.Create(writer.ToString());

    }

}

Html.RenderPartial内部实现

1 public static void RenderPartial(this HtmlHelper htmlHelper, string partialViewName)

2 {

3     htmlHelper.RenderPartialInternal(partialViewName, htmlHelper.ViewData, null, htmlHelper.ViewContext.Writer, ViewEngines.Engines);

4 }

3. 在Razor视图中语法不一样：

语法

1 @Html.Partial("PartialViewName")

2

3 @{ Html.RenderPartial("PartialViewName"); }