Microsoft asp.net chart

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Microsoft Download Manager is free and available for download now. Warning: This site requires the use of scripts, which your browser does not currently allow. See how to enable scripts. Download Microsoft Chart Controls for Microsoft. NET Framework 3. Microsoft Chart Controls for Microsoft.

Select Language:. Choose the download you want. Download Summary:. The ChartSaveToCache. You'll create this page in a moment. At the end of the page there's a link to a page named ClearCache. That's a page that you'll also create shortly. You need the ClearCache. The code first checks whether anything was passed as the key value in the query string.

If so, the code tries to read a chart out of the cache by calling the GetFromCache method and passing it the key. If it turns out that there's nothing in the cache under that key which would happen the first time that the chart is requested , the code creates the chart as usual. When the chart is finished, the code saves it to the cache by calling SaveToCache.

That method requires a key so the chart can be requested later , and the amount of time that the chart should be saved in the cache. The exact time you'd cache a chart would depend on how often you thought the data it represents might change. The SaveToCache method also requires a slidingExpiration parameter — if this is set to true, the timeout counter is reset each time the chart is accessed. In this case, it in effect means that the chart's cache entry expires 2 minutes after the last time someone accessed the chart.

The alternative to sliding expiration is absolute expiration, meaning that the cache entry would expire exactly 2 minutes after it was put into the cache, no matter how often it had been accessed.

Finally, the code uses the WriteFromCache method to fetch and render the chart from the cache. Note that this method is outside the if block that checks the cache, because it will get the chart from the cache whether the chart was there to begin with or had to be generated and saved in the cache.

Notice that in the example, the AddTitle method includes a timestamp. It adds the current date and time — DateTime. Now — to the title. As noted earlier, you don't normally have to have a page like this.

You're creating it here only to make it easier to test caching. Run the ShowCachedChart. The page displays the chart image based on the code contained in the ChartSaveToCache.

Take note of what the timestamp says in the chart title. Notice that the timestamp is the same as before, which indicates that the chart was not regenerated, but was instead read from the cache.

In ShowCachedChart. This takes you to ClearCache. Click the Return to ShowCachedChart. Notice that this time the timestamp has changed, because the cache has been cleared. Therefore, the code had to regenerate the chart and put it back into the cache. You can also save a chart as an image file for example, as a. You can then use the image file the way you would any image. The advantage is the file is stored rather than saved to a temporary cache.

You can save a new chart image at different times for example, every hour and then keep a permanent record of the changes that occur over time.

Note that you must make sure that your web application has permission to save a file to the folder on the server where you want to put the image file. The code first checks to see whether the. Exists method. If the file does not exist, the code creates a new Chart from an array. This time, the code calls the Save method and passes the path parameter to specify the file path and file name of where to save the chart. Return to WebMatrix.

Notice that an image file named chart Finally, you can save a chart as an XML file on the server. An advantage of using this method over caching the chart or saving the chart to a file is that you could modify the XML before displaying the chart if you wanted to. This code is similar to the code that you saw earlier for storing a chart in the cache, except that it uses an XML file.

The code first checks to see whether the XML file exists by calling the File. If the file does exist, the code creates a new Chart object and passes the file name as the themePath parameter. This creates the chart based on whatever's in the XML file. If the XML file doesn't already exist, the code creates a chart like normal and then calls SaveXml to save it.

The chart is rendered using the Write method, as you've seen before. The chart is displayed. Take note of the timestamp in the chart's title. The XMLChart. The chart shows the same timestamp as the first time you ran the page. That's because the chart is being generated from the XML you saved earlier.

This time, the timestamp is updated, because the Chart helper had to recreate the XML file. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.

Contents Exit focus mode. Is this page helpful? You can drag the chart into an ASPX file using the design view which will make some necessary configuration changes to your web. This entry allows you to use the chart control with the familiar asp tag prefix that other built-in ASP.

NET controls utilize. I'll go into more detail about the HTTP handler later. The code in Figure 2 shows the basic elements of a chart. Every chart includes at least one Series object populated with data. The ChartType property of each series will determine the type of chart used to plot the series the default type is a column chart.

Each chart can also contain one or more ChartArea objects where plotting will occur. You can customize nearly every visual element of the ASP. NET chart control, including backgrounds, axes, titles, legends, and labels. The chart control is so highly customizable that you should have a plan in place to keep the charts in your application looking consistent.

In this column, I will use a builder strategy to apply consistent fonts and colors to all charts. This builder class will also allow the use of the charting control outside the confines of an ASP. NET page. In looking for sample data to use in this column, I briefly considered using historical data from the stock market, but the data from the past year has been depressing, so instead I decided to use data from the United States Bureau of Transportation Statistics bts.

The sample application for this column includes a file with information about every domestic flight originating from my home airport Baltimore Washington International, or BWI during January of The data includes the destination city, distance, taxiing times, and delays. This data is represented in C using the class in Figure 3. The first chart I built from this data was a chart to show the most popular destinations for flights from the Baltimore airport see Figure 4.

This chart is built using very little code in the ASPX file or its associated codebehind file. This ChartBuilder base class uses a template method design pattern to assemble the pieces of a chart. The template method specifies the basic algorithm required to produce an aesthetically consistent and functional chart, but provides hooks for a subclass to customize the assembled pieces.

The template method is named BuildChart, and it is shown in Figure 5. Each Build method in the ChartBuilder class has an associated Customize method.

Once the Build method has constructed its piece of the chart, it invokes the Customize method. A derived class can override the customization method to apply chart-specific settings.

One such example is the BuildChartTitle method, shown in Figure 6. The majority of the work for the TopDestinationsChartBuilder is dedicated to customizing the chart series, which includes adding all of the data points for display. Fortunately, finding the top five destination cities from a collection of Flight objects is ridiculously easy using LINQ to Objects, as you can see in Figure 7.

The OrderByDescending operator then sorts the sequence of groupings by the number of flights in each group. Finally, the code uses the Take operator to identify the top five destinations from the sequence. The LINQ query produces a sequence of groupings.

You can loop through these groupings to add information to the chart. The Key property of each grouping represents the value of the key selected in the GroupBy operator in this case, the value of the Destination city. The code uses the destination as the X value for each data point.