添加本地图层出现要求cross domain policy的错误

错误描述：

A security exception occured while trying to connect to the REST endpoint. Make sure you have a cross domain policy file available at the root for your server that allows for requests from this application.

就是要求跨域访问的文件，在IIS目录中（C:\inetpub\wwwroot）

解决方法：

在C:\inetpub\wwwroot目录中新建文本文件

粘贴如下代码：

<?xml version="1.0" encoding="utf-8"?>
<access-policy>
    <cross-domain-access>
        <policy>
            <allow-from>
                <domain uri="*"/>
            </allow-from>
            <grant-to>
                <resource path="/" include-subpaths="true"/>
            </grant-to>
        </policy>
    </cross-domain-access>
</access-policy>

保存，重命名为“clientaccesspolicy.xml”即可。

这样，下面的代码即可调用成功：

        <esri:Map>
            <esri:ArcGISDynamicMapServiceLayer ID="MyTiledLayer" Url="http://ｉｐａｄｄｒｅｓｓ/arcgis/rest/services/ＳｅｒｖｉｃｅＮａｍｅ/MapServer" />
        </esri:Map>