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查询查询任务 Silverlight 与 ESRI 地图

发布于 2024-09-13 03:10:31 字数 57 浏览 5 评论 0原文

我在哪里可以学习如何查询 ESRI 地图的图层？我需要查询 esri 地图图层并将数据存储在字典中。

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梦巷 2024-09-20 03:10:31

ESRI Silverlight SDK 为此提供了一个QueryTask 对象。您的地图必须通过 ArcGIS Server 来发布，并提供用于查询的 REST 端点 (URL)。查看 ESRI 示例页面。它们包括不同查询风格的几个示例。

在最简单的形式中，查询将类似于...

void DoQuery()
{
    QueryTask queryTask = new QueryTask("[AGS Service Endpoint]"); // Service url typically in format of http://[servername]/ArcGIS/rest/services/[ServiceName]/MapServer/[LayerId]
    queryTask.ExecuteCompleted += QueryTask_ExecuteCompleted;

    ESRI.ArcGIS.Client.Tasks.Query query = new ESRI.ArcGIS.Client.Tasks.Query();
    query.Where = "1=1"; // Return all features
    query.OutFields.Add("*"); // Return all fields
    queryTask.ExecuteAsync(query);
}

void QueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs args)
{
    FeatureSet featureSet = args.FeatureSet;

    if (featureSet == null || featureSet.Features.Count == 0) return;

    foreach (Graphic feature in featureSet.Features)
    {
        // feature.Attributes is a type Dictionary<string, object> containing all attributes. Do something with it.
    }
}

The ESRI Silverlight SDK provides a QueryTask object for this. Your map must be published with ArcGIS Server providing a REST endpoint (URL) to query against. Check out the ESRI sample page. They include several examples of different styles of queries.

In its simplest form, a query will look like...

void DoQuery()
{
    QueryTask queryTask = new QueryTask("[AGS Service Endpoint]"); // Service url typically in format of http://[servername]/ArcGIS/rest/services/[ServiceName]/MapServer/[LayerId]
    queryTask.ExecuteCompleted += QueryTask_ExecuteCompleted;

    ESRI.ArcGIS.Client.Tasks.Query query = new ESRI.ArcGIS.Client.Tasks.Query();
    query.Where = "1=1"; // Return all features
    query.OutFields.Add("*"); // Return all fields
    queryTask.ExecuteAsync(query);
}

void QueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs args)
{
    FeatureSet featureSet = args.FeatureSet;

    if (featureSet == null || featureSet.Features.Count == 0) return;

    foreach (Graphic feature in featureSet.Features)
    {
        // feature.Attributes is a type Dictionary<string, object> containing all attributes. Do something with it.
    }
}

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