echart 图表 在.net中生成图片的方法

经过中午近两个小时的努力，终于可以实现了：echart 图表 在.net中生成图片

以下源代码：

前台页面：

<!DOCTYPE html>
<html>
<head>
    <title>生成图片</title>
    <meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
</head>
<body>
    <div class="maincontent">
        <div id="chart0" style="height: 400px;" class="l chart w-50"></div>
    </div>

<!-- ECharts单文件引入 -->
    <script type="text/javascript" src="/statics/js/com/jquery-1.8.2.min.js"></script>
    <script src="/statics/plugins/com/Echarts/build/dist/echarts.js" type="text/javascript"></script>
    <script type="text/javascript">
        // 路径配置
        require.config({
            paths: {
                echarts: '/statics/plugins/com/ECharts/build/dist'
            }
        });
        // 使用
        require(
                [
                    'echarts',
                    'echarts/chart/bar' // 使用柱状图就加载bar模块，按需加载
                ],
                function (ec) {
                    // 基于准备好的dom，初始化echarts图表
                    var datas = [

{
                            animation: false,//为true，则生不出完整的图片
                            title: {
                                text: '世界人口总量',
                                subtext: '数据来自网络'
                            },
                            tooltip: {
                                trigger: 'axis'
                            },
                            legend: {
                                data: ['2011年', '2012年']
                            },
                            toolbox: {
                                show: true,
                                feature: {
                                    mark: { show: true },
                                    dataView: { show: true, readOnly: false },
                                    magicType: { show: true, type: ['line', 'bar'] },
                                    restore: { show: true },
                                    saveAsImage: { show: true }
                                }
                            },
                            calculable: true,
                            xAxis: [
                                {
                                    type: 'value',
                                    boundaryGap: [0, 0.01]
                                }
                            ],
                            yAxis: [
                                {
                                    type: 'category',
                                    data: ['巴西', '印尼', '美国', '印度', '中国', '世界人口(万)']
                                }
                            ],
                            series: [
                                {
                                    name: '2011年',
                                    type: 'bar',
                                    data: [18203, 23489, 29034, 104970, 131744, 630230]
                                },
                                {
                                    name: '2012年',
                                    type: 'bar',
                                    data: [19325, 23438, 31000, 121594, 134141, 681807]
                                }
                            ]
                        }

];
                    $('.chart').each(function (i, n) {
                        var myChart = ec.init(document.getElementById('chart' + i));
                        // 为echarts对象加载数据
                        myChart.setOption(datas[i]);
                        var data = "ImageSend=" + encodeURI(myChart.getDataURL("png"));
                        $.ajax({
                            type: "post",
                            url: "/ajax/save.aspx",
                            data: "action=saveImage&" + data,
                            cache: false,
                            success: function (msg) {

}
                        });
                    });
                }
            );
    </script>

</body>

</html>

后台ajax代码：

using DataService.Framework.BaseFramework.Helper;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Autofac;
using DataService.Framework.Ioc;
using System.Collections;
using System.IO;
using System.Text;

public partial class ajax_save : System.Web.UI.Page
{
    private string strAction = "";
    public ajax_save()
    {
        strAction = RequestHelps.Post("action");
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (strAction != null && strAction.Trim() != "")
        {
            switch (strAction)
            {
                case "saveImage":
                    SaveImage();
                    break;
            }
        }
    }
    /// <summary>
    /// 修改问卷皮肤
    /// </summary>
    protected void SaveImage()
    {
        int returnid = 0;
        string ImageSend = RequestHelps.Post("ImageSend");
        ImageSend=Server.UrlDecode(ImageSend);
             ImageSend = ImageSend.Replace(" ", "+");
              try {
                  string[] url = ImageSend.Split(',');
                  string u = url[1];
                  // Base64解码
                  byte[] b = Convert.FromBase64String(u);
                string name = "E:\\12.png";
                FileHelper.ByteStreamToFile(name, b);
              } catch (Exception e) {

}

System.Web.HttpContext.Current.Response.Write(returnid.ToString());
        System.Web.HttpContext.Current.Response.End();
    }
}

//二进制数组Byte[]生成文件
        public static bool ByteStreamToFile(string createFileFullPath, byte[] streamByte)
        {
            if (!File.Exists(createFileFullPath))
            {
                FileStream fileStream = File.Create(createFileFullPath);
                fileStream.Write(streamByte, 0, streamByte.Length);
                fileStream.Close();
                return true;
            }
            return false;
        }