ArcGIS数据访问途径简单介绍

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转载最新推荐文章于 2022-03-29 13:41:29 发布 · 203 阅读

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原文链接：http://www.cnblogs.com/xmwang/archive/2011/11/10/2244974.html

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#c# #数据库

本文介绍了ArcGIS中两种主要的数据访问方法：通过图层访问和通过IWorkspace访问GeoDatabase。通过图层访问包括使用MxDocument和MapDocument访问地图图层；通过IWorkspace访问则涉及建立不同类型的GeoDatabase连接，并通过IFeatureWorkspace访问要素类。

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ArcGIS数据访问比较简单，有现成的组件可以利用，主要有两种方式，一种是通过图层访问，一种是IWorkspace方式访问

一、通过图层访问

a.通过MxDocument访问地图图层

[C#]

IMap pMap;
IMaps pMaps = pMxDocument.Maps;
for (int i = 0; i <= pMaps.Count - 1; i++)
{
    pMap = pMaps.get_Item(i);
    Console.WriteLine(pMap.Name);
    IEnumLayer pEnumLayer = pMap.get_Layers(null, true);
    pEnumLayer.Reset();
    ILayer pLayer = pEnumLayer.Next();
    while (pLayer != null)
    {
        Console.WriteLine(pLayer.Name);
        pLayer = pEnumLayer.Next();
    }
}

b.通过MapDocument访问地图图层，不需要ArcMap，直接读.mxd文件

[C#]

IMapDocument pMapDocument = new MapDocumentClass();
if (pMapDocument.get_IsMapDocument(path))
{
    pMapDocument.Open(path, null);
    IMap pMap;
    for (int i = 0; i <= pMapDocument.MapCount - 1; i++)
    {
        pMap = pMapDocument.get_Map(i);
        Console.WriteLine(pMap.Name);
        IEnumLayer pEnumLayer = pMap.get_Layers(null, true);
        pEnumLayer.Reset();
        ILayer pLayer = pEnumLayer.Next();
        while (pLayer != null)
        {
            Console.WriteLine(pLayer.Name);

            pLayer = pEnumLayer.Next();
        }
    }
}

二、通过IWorkspace访问GeoDatabase

可以通过IWorkspace访问三种GeoDatabase：Personal、File、ArcSDE

建立File型GeoDatabase数据库连接

[C#]

// For example, path = @"C:\myData\myfGDB.gdb".
public static IWorkspace FileGdbWorkspaceFromPath(String path)
{
    Type factoryType = Type.GetTypeFromProgID(
        "esriDataSourcesGDB.FileGDBWorkspaceFactory");
    IWorkspaceFactory workspaceFactory = (IWorkspaceFactory)Activator.CreateInstance
        (factoryType);
    return workspaceFactory.OpenFromFile(path, 0);
}

建立Personal型GeoDatabase数据库连接

[C#]

// For example, path = @"C:\myData\mypGDB.mdb".
public static IWorkspace AccessWorkspaceFromPath(String path)
{
    Type factoryType = Type.GetTypeFromProgID(
        "esriDataSourcesGDB.AccessWorkspaceFactory");
    IWorkspaceFactory workspaceFactory = (IWorkspaceFactory)Activator.CreateInstance
        (factoryType);
    return workspaceFactory.OpenFromFile(path, 0);
}

通过IFeatureWorkspace访问要素类

[C#]

// Cast the workspace to IFeatureWorkspace and open a feature class.
IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspace;
IFeatureClass featureClass = featureWorkspace.OpenFeatureClass("Parcels");

转载于:https://www.cnblogs.com/xmwang/archive/2011/11/10/2244974.html