新的asp.net图表控件 - 他们将与MVC（最终）？ [英] New asp.net charting controls - will they work with MVC (eventually)?

问题描述

Scott Gu刚刚发布了一组由.NET小组分发的新的图表控件。他们看起来不可思议： http://weblogs.asp.net/scottgu/archive/2008/11/24/new-asp-net-charting-control-lt-asp-chart- runat-quot-server-quot-gt.aspx

Scott Gu just posted about a new set of charting controls being distributed by the .NET team. They look incredible: http://weblogs.asp.net/scottgu/archive/2008/11/24/new-asp-net-charting-control-lt-asp-chart-runat-quot-server-quot-gt.aspx

百万美元的问题是...他们会使用MVC，如果是，什么时候？

The million dollar question is ... will they work with MVC, and if so, when?

推荐答案

您可以通过两种方式使用图表控件：

You can use the chart controls in two ways:

从控制器生成图片

通过生成图表并将其作为图片从操作中返回（正如Chatuman指的是我的想法） ：

By generating the chart and returning it as an image from an action (as Chatuman is referring to I think):

Chart chart = new Chart();
chart.BackColor = Color.Transparent;
chart.Width = Unit.Pixel(250);
chart.Height = Unit.Pixel(100);

Series series1 = new Series("Series1");
series1.ChartArea = "ca1";
series1.ChartType = SeriesChartType.Pie;
series1.Font = new Font("Verdana", 8.25f, FontStyle.Regular);
series1.Points.Add(new DataPoint { 
                AxisLabel = "Value1", YValues = new double[] { value1 } });
series1.Points.Add(new DataPoint {
                AxisLabel = "Value2", YValues = new double[] { value2 } });
chart.Series.Add(series1);

ChartArea ca1 = new ChartArea("ca1");
ca1.BackColor = Color.Transparent;
chart.ChartAreas.Add(ca1);

using (var ms = new MemoryStream())
{
    chart.SaveImage(ms, ChartImageFormat.Png);
    ms.Seek(0, SeekOrigin.Begin);

    return File(ms.ToArray(), "image/png", "mychart.png");
}

WebForms样式

这样，您只需将图表包含在.aspx视图中（就像传统的Web表单一样）。为此，您必须连接web.config中的相关位。

This way you just include the chart in your .aspx views (just like with traditional web forms). For this you'll have to hook up the relevant bits in your web.config

<controls>
    ...
    <add tagPrefix="asp"
         namespace="System.Web.UI.DataVisualization.Charting"
         assembly="System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</controls>

<httpHandlers>
    ...
    <add path="ChartImg.axd"
         verb="GET,HEAD"
         validate="false"
         type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</httpHandlers>

<handlers>
    ...
    <add name="ChartImageHandler"
         preCondition="integratedMode" 
         verb="GET,HEAD"
         path="ChartImg.axd"
         type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</handlers>

在构建图表时，不能在DataPoint元素中运行代码，你需要在View类中有一个方法。这对我工作确定。以这种方式工作使控件呈现URL到由图表控件http处理程序生成的图像。

You can't run code inside the DataPoint elements when building the chart, so to hook up your data you'll need a method in the View class. This works ok for me. Working this way makes the control render a URL to an image generated by the chart control http handler. In your deployment you'll need to provide a writable folder for it to cache the images.

* VS 2010 / .NET 4 Support * 在您的部署中，您需要提供可写入的文件夹才能缓存图片。

* VS 2010 / .NET 4 Support *

要在.NET 4中工作，您需要使用适当的公钥令牌更改版本4.0.0.0的图表引用。

To get this working in .NET 4 you need to change the chart references to version 4.0.0.0 with the appropriate public key token.

同样，图表控件现在生成到当前请求路径的URL，而不是请求路由。对我来说，这意味着所有的图表请求导致404错误，因为 / {Controller} /ChartImg.axd 和等效被路由阻止。为了解决这个问题，我添加了额外的IgnoreRoute调用来覆盖我的用法 - 一个更通用的解决方案会更好：

Also it seems that the chart control now generates urls to the current request path rather than the request route. For me this meant that all the chart requests resulted in 404 errors because /{Controller}/ChartImg.axd and equivalents were blocked by routes. To fix this I added extra IgnoreRoute calls that cover my usages - a more general solution would be better:

public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("ChartImg.axd/{*pathInfo}");
    routes.IgnoreRoute("{controller}/ChartImg.axd/{*pathInfo}");
    routes.IgnoreRoute("{controller}/{action}/ChartImg.axd/{*pathInfo}");
...

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