Arcengine创建内存工作空间、要素类

创建内存工作空间

public static IWorkspace CreateInMemoryWorkspace()
{
  // Create an in-memory workspace factory.
  Type factoryType = Type.GetTypeFromProgID("esriDataSourcesGDB.InMemoryWorkspaceFactory");
  IWorkspaceFactory workspaceFactory = (IWorkspaceFactory)
    Activator.CreateInstance(factoryType);
    
  // Create an in-memory workspace.
  IWorkspaceName workspaceName = workspaceFactory.Create("", "MyWorkspace",
    null, 0);
  // Cast for IName and open a reference to the in-memory workspace through the name object.
  IName name = (IName)workspaceName;
  IWorkspace workspace = (IWorkspace)name.Open();
  return workspace;
}

创建要素类

/// <summary>
/// 在指定的数据库中创建与源要素类相同的要素类
/// </summary>
/// <param name="pWorkspace"></param>
/// <param name="pSrcFC"></param>
/// <param name="sTargetName"></param>
/// <param name="pTargetSrf"></param>
/// <param name="sOutputFields"></param>
/// <returns></returns>
public static IFeatureClass CreateFeatureClass(IWorkspace pWorkspace,
                                               IFeatureClass pSrcFC,
                                               string sTargetName = null,
                                               ISpatialReference pTargetSrf = null,
                                               string sOutputFields = null)
{
    if (string.IsNullOrEmpty(sTargetName))
    {
        sTargetName = (pSrcFC as IDataset).Name;
    }
    sTargetName = GetDatasetName(sTargetName);
    DeleteDataset(pWorkspace, sTargetName);
    //验证字段
    IFields pFields;
    string sShapeFieldName;
    string sError;
    CheckFields(pSrcFC, pWorkspace, out pFields, out sShapeFieldName, out sError);
    //根据输出字段限制，处理字段
    if (!string.IsNullOrWhiteSpace(sOutputFields))
    {
        IFieldsEdit pFieldsEdit = pFields as IFieldsEdit;
        string[] pOutputFields = sOutputFields.Split(',');
        for (int i = pFields.FieldCount - 1; i >= 0; i--)
        {
            IField pField = pFields.get_Field(i);
            if (pField.Type == esriFieldType.esriFieldTypeGeometry ||
                pField.Type == esriFieldType.esriFieldTypeOID)
            {
                continue;
            }
            bool bFind = false;
            foreach (string sOutputField in pOutputFields)
            {
                if (sOutputField == pField.Name)
                {
                    bFind = true;
                    break;
                }
            }
            if (!bFind)
            {
                pFieldsEdit.DeleteField(pField);
            }
        }
    }

    //修改几何字段中的空间参考信息
    if (pTargetSrf != null)
    {
        int iIndex = pFields.FindField(sShapeFieldName);
        //几何定义
        IGeometryDef pGeometryDef = pFields.get_Field(iIndex).GeometryDef;
        IGeometryDefEdit pGeometryDefEdit = pGeometryDef as IGeometryDefEdit;
        pGeometryDefEdit.SpatialReference_2 = pTargetSrf;
    }

    IFeatureClass pFeatureClass = CreateFeatureClass(pWorkspace, pSrcFC,
                                                     pFields, sShapeFieldName, sTargetName, null, pTargetSrf);
    return pFeatureClass;
}

/// <summary>
/// 创建要素类，考虑要素类存在要素数据集中
/// </summary>
/// <param name="pWorkspace"></param>
/// <param name="pSrcFC"></param>
/// <param name="pFields"></param>
/// <param name="sShapeFieldName"></param>
/// <param name="sTargetName"></param>
/// <param name="sAlias"></param>
/// <param name="pTargetSrf"></param>
/// <returns></returns>
public static IFeatureClass CreateFeatureClass(IWorkspace pWorkspace,
                                               IFeatureClass pSrcFC,
                                               IFields pFields,
                                               string sShapeFieldName,
                                               string sTargetName = null,
                                               string sAlias = null,
                                               ISpatialReference pTargetSrf = null)
{
    UID CLSID = new UIDClass();
    CLSID.Value = "esriGeoDatabase.Feature";

    if (string.IsNullOrEmpty(sTargetName))
    {
        sTargetName = GetDatasetName((pSrcFC as IDataset).Name);
    }
    IFeatureClass pFeatureClass = null;
    //是否需要创建要素数据集
    IFeatureDataset pTargetDataset = GetFeatureDataset(pWorkspace, pSrcFC, pTargetSrf);
    try
    {
        if (pSrcFC.FeatureType == esriFeatureType.esriFTAnnotation)
        {
            //Anno Workspace
            IFeatureWorkspaceAnno pFWSAnno = pWorkspace as IFeatureWorkspaceAnno;
            //获得AnnoFeatureClass的显示参数units和referencescale
            IAnnoClass pAnnoClass = pSrcFC.Extension as IAnnoClass;

            IGraphicsLayerScale pGraphicsLayerScale = new GraphicsLayerScaleClass();
            pGraphicsLayerScale.Units = pAnnoClass.ReferenceScaleUnits;
            pGraphicsLayerScale.ReferenceScale = pAnnoClass.ReferenceScale;

            IObjectClassDescription pOCDesc = new AnnotationFeatureClassDescription();
            pFeatureClass = pFWSAnno.CreateAnnotationClass(sTargetName, pFields, pOCDesc.InstanceCLSID,
                                                           pOCDesc.ClassExtensionCLSID, pSrcFC.ShapeFieldName, "", pTargetDataset,
                                                           null, pAnnoClass.AnnoProperties, pGraphicsLayerScale,
                                                           pAnnoClass.SymbolCollection, false);
        }
        else
        {
            if (pTargetDataset != null)
            {
                pFeatureClass = pTargetDataset.CreateFeatureClass(sTargetName, pFields, CLSID, null, pSrcFC.FeatureType, sShapeFieldName, "");
            }
            else
            {
                pFeatureClass = (pWorkspace as IFeatureWorkspace).CreateFeatureClass(sTargetName, pFields, CLSID, null, pSrcFC.FeatureType, sShapeFieldName, "");
            }
        }
    }
    finally
    {
        if (pTargetDataset != null)
        {
            Marshal.ReleaseComObject(pTargetDataset);
        }
    }
    //设置要素类别名
    if (string.IsNullOrWhiteSpace(sAlias))
    {
        sAlias = pSrcFC.AliasName;
    }
    AlterDatasetAlias(pFeatureClass, sAlias);
    return pFeatureClass;
}

Arcengine创建内存工作空间、要素类

原文：https://www.cnblogs.com/King2019Blog/p/11319510.html