Html.RenderPartial和Html.Partial在Razor视图中的区别

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)。

　

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 )

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

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());
    }
}

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());
    }
}
 
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1 public static void RenderPartial(this HtmlHelper htmlHelper, string partialViewName)
2 {
3     htmlHelper.RenderPartialInternal(partialViewName, htmlHelper.ViewData, null, htmlHelper.ViewContext.Writer, ViewEngines.Engines);
4 }

1 public static void RenderPartial(this HtmlHelper htmlHelper, string partialViewName)
2 {
3     htmlHelper.RenderPartialInternal(partialViewName, htmlHelper.ViewData, null, htmlHelper.ViewContext.Writer, ViewEngines.Engines);
4 }
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3. 在Razor视图中语法不一样：

@Html.Partial("PartialViewName")
2 
3 @{ Html.RenderPartial("PartialViewName"); }

1 @Html.Partial("PartialViewName")
2 
3 @{ Html.RenderPartial("PartialViewName"); }
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