esri 对接

     

一、获取字段信息

/// <summary>
/// 获取字段信息
/// </summary>
/// <param name="pField"></param>
public static void GetMsgFromField(IField pField)
{
    var name = pField.Name; //字段名  OBJECTID;SHAPE;BSM;HDMC;BZ;TBMJ

    bool req = pField.Required;  //是否为必要字段  true;true;false;false;false;false

    bool eid = pField.Editable;  //是否可编辑  false;true;true;true;true;true

    var aName = pField.AliasName; //字段别名   OBJECTID;SHAPE;标识码;HDMC;备注;图斑面积

    bool nullable = pField.IsNullable; //可包含空值 false;true;true;true;true;true

    //bool valid = pField.CheckValue(1111); //检查Value在字段中是否有效,感觉没啥用处啊

    esriFieldType fieldType  = pField.Type;  //字段类型 esriFieldTypeOID;esriFieldTypeGeometry;esriFieldTypeString;esriFieldTypeString;esriFieldTypeString;esriFieldTypeDouble

    var varType = pField.VarType;   //字段的变量类型  3;13;8;8;8;5

    int len = pField.Length; //字段长度  4;0;18;100;2147483647;8

    int preci = pField.Precision; //精度 0;0;0;0;0;0

    var dValue = pField.DefaultValue; //默认值

    int sca=pField.Scale;//字段范围  0;0;0;0;0;0
            
    bool domFixed = pField.DomainFixed; //是否为混合域  true;false;false;false;false;false

    IDomain pDom = pField.Domain; //字段的默认域   null;null;null;有;null;有
    if (pDom != null)
    {
        string domName = pDom.Name;  //默认值域名  DM;JSR
        string domDes = pDom.Description; //默认值域描述  代码;净收入
        esriFieldType pFieldType = pDom.FieldType; //字段类型   esriFieldTypeString;esriFieldTypeDouble
        esriDomainType pDomainType = pDom.Type;  //域类型  esriDTCodedValue;esriDTRange
        int domId = pDom.DomainID; //1051;1052
        bool domVail= pDom.MemberOf("Q"); //检查Value在字段中是否有效 true
        string domOwner = pDom.Owner;  //所属者 "";""
        esriMergePolicyType pPolicyType = pDom.MergePolicy;  //合并策略 esriMPTDefaultValue;esriMPTSumValues
        esriSplitPolicyType pSplitPolicy = pDom.SplitPolicy; //分割策略 esriSPTDefaultValue;esriSPTGeometryRatio
    }

    IGeometryDef pGeometryDef = pField.GeometryDef;  //几何定义  null;有;null
    if (pGeometryDef != null)
    {
        esriGeometryType pGeometryType = pGeometryDef.GeometryType; //几何类型  ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon
        int numPoints = pGeometryDef.AvgNumPoints;  //每个要素的估计平均点数  0
        int gridCount = pGeometryDef.GridCount;  //空间索引网格的数目    1
        double gridSize = pGeometryDef.get_GridSize(0); //空间索引网格的大小   350
        bool hasZ = pGeometryDef.HasZ; //是否具有Z值   false
        bool hasM = pGeometryDef.HasM; //是否具有M值   false
        ISpatialReference pSpatialReference = pGeometryDef.SpatialReference; //空间参考  ISpatialReference继承ISpatialReferenceInfo接口
    }
}

 

二、创建字段

1、由已有要素类创建

   1）、普通方式

/// <summary>
/// 从源数据集获取字段集合
/// </summary>
/// <param name="fClass">源数据集</param>
/// <returns></returns>
public static IFields GetFieldsBySource(IFeatureClass fClass)
{
    IFields flds = new FieldsClass();
    IFieldsEdit fldsEdit = flds as IFieldsEdit;
    for (int i = 0; i < fClass.Fields.FieldCount; i++)
    {
        if (!fClass.Fields.Field[i].Required)  //过滤必要字段  Geometry字段为必要字段但可编辑
            fldsEdit.AddField(fClass.Fields.Field[i]);
    }

    //修改IField字段
    IField pGeometryField = fClass.Fields.get_Field(fClass.FindField(fClass.ShapeFieldName));

    IGeometryDef pGeomDef = new GeometryDefClass();
    IGeometryDefEdit pGeomDefEdit = pGeomDef as IGeometryDefEdit;
    pGeomDefEdit.GeometryType_2 = pGeometryField.GeometryDef.GeometryType;
    pGeomDefEdit.SpatialReference_2 = pGeometryField.GeometryDef.SpatialReference;

    IFieldEdit pGeometryFieldEdit = pGeometryField as IFieldEdit;
    pGeometryFieldEdit.GeometryDef_2 = pGeomDefEdit;
    fldsEdit.AddField(pGeometryField);

    return flds;
}

  2)、IObjectCopy接口

/// <summary>
/// IObjectCopy从源数据集拷贝字段
/// </summary>
/// <param name="featureClass"></param>
/// <returns></returns>
public IFields GetFieldsFromFClass(IFeatureClass featureClass)
{
    IObjectCopy pObjectCopy = new ObjectCopyClass();
    IFields pCopiedFields = pObjectCopy.Copy(featureClass.Fields) as IFields;

    // Find the shape field.若不设置，导入数据的时候可能会报错
    //int shapeFieldIndex = featureClass.FindField(featureClass.ShapeFieldName);
    //IField shapeField = pCopiedFields.get_Field(shapeFieldIndex);
    var hasZ = shapeField.GeometryDef.HasZ;//是否含有Z值

    设置几何字段属性
    //IGeometryDef pGeomDef = new GeometryDefClass();
    //IGeometryDefEdit pGeomDefEdit = pGeomDef as IGeometryDefEdit;
    //pGeomDefEdit.GeometryType_2 = shapeField.GeometryDef.GeometryType;
    //pGeomDefEdit.SpatialReference_2 = shapeField.GeometryDef.SpatialReference;
    //IFieldEdit pGeometryFieldEdit = shapeField as IFieldEdit;
    //pGeometryFieldEdit.GeometryDef_2 = pGeomDefEdit;
    return pCopiedFields;
}

2、自定义创建字段

/// <summary>
/// 自定义创建字段
/// </summary>
/// <returns></returns>
public IFields CreateIFields()
{
    // 创建字段集合.
    IFields fields = new FieldsClass();
    IFieldsEdit fieldsEdit = (IFieldsEdit)fields;

    // 在字段集合中添加一个Object ID. 必要字段.
    IField oidField = new FieldClass();
    IFieldEdit oidFieldEdit = (IFieldEdit)oidField;
    oidFieldEdit.Name_2 = "OID";
    oidFieldEdit.AliasName_2 = "索引";
    oidFieldEdit.Type_2 = esriFieldType.esriFieldTypeOID;
    fieldsEdit.AddField(oidField);

    //给要素类创建几何定义和空间参考
    IGeometryDef geometryDef = new GeometryDefClass();
    IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef;
    geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint;

    ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();
    ISpatialReference spatialReference = spatialReferenceFactory.CreateProjectedCoordinateSystem((int)esriSRProjCSType.esriSRProjCS_NAD1983UTM_20N);
    ISpatialReferenceResolution spatialReferenceResolution = (ISpatialReferenceResolution)spatialReference;//提供对控制空间引用分辨率的成员的访问。
    spatialReferenceResolution.ConstructFromHorizon();//定义此空间参照的xy分辨率和域范围（基于其地平线的范围）。低精度SRS当前单位的最小分辨率为1/10毫米。
    ISpatialReferenceTolerance spatialReferenceTolerance = (ISpatialReferenceTolerance)spatialReference;//访问空间信息和M偏差
    spatialReferenceTolerance.SetDefaultXYTolerance();//设置用于控制X和Y尺寸中的点合并的默认簇公差（相当于当前空间参考单位中的1 mm）。

    geometryDefEdit.SpatialReference_2 = spatialReference;

    //添加几何字段.附加几何定义
    IField geometryField = new FieldClass();
    IFieldEdit geometryFieldEdit = (IFieldEdit)geometryField;
    geometryFieldEdit.Name_2 = "Shape";
    geometryFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;
    geometryFieldEdit.GeometryDef_2 = geometryDef;
    fieldsEdit.AddField(geometryField);

    // Create a text field called "Name" for the fields collection.
    IField nameField = new FieldClass();
    IFieldEdit nameFieldEdit = (IFieldEdit)nameField;
    nameFieldEdit.Name_2 = "Name";
    nameFieldEdit.Type_2 = esriFieldType.esriFieldTypeString;
    nameFieldEdit.Length_2 = 20;
    fieldsEdit.AddField(nameField);

    return fields;
}

3、由FeatureClassDescriptionClass创建

/// <summary>
/// 使用描述对象创建要素类和修改默认的几何定义（定义空间参考和几何类型）
/// </summary>
/// <param name="spatialReference">空间参考</param>
/// <returns></returns>
public IFields CreateIFieldsByDescription(ISpatialReference spatialReference)
{
    // 初始化描述对象获得必要字段
    IFeatureClassDescription fcDescription = new FeatureClassDescriptionClass();
    IObjectClassDescription ocDescription = (IObjectClassDescription)fcDescription;
    IFields fields = ocDescription.RequiredFields;
    IFieldsEdit fieldsEdit = (IFieldsEdit)fields;

    //在必要字段中找到“shape”字段并修改它的几何定义（修改为点和设置空间参考）
    int shapeFieldIndex = fields.FindField(fcDescription.ShapeFieldName);
    IField field = fields.get_Field(shapeFieldIndex);
    IGeometryDef geometryDef = field.GeometryDef;
    IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef;
    geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint;
    geometryDefEdit.SpatialReference_2 = spatialReference;

    // 添加一个 "Name" 字段.
    IField nameField = new FieldClass();
    IFieldEdit fieldEdit = (IFieldEdit)nameField;
    fieldEdit.Name_2 = "Name";
    fieldEdit.Type_2 = esriFieldType.esriFieldTypeString;
    fieldsEdit.AddField(nameField);

    return fields;
}

三、验证字段

/// <summary>
/// 验证字段
/// </summary>
/// <param name="fields">字段集合</param>
/// <param name="sourceWk">源工作空间</param>
/// <param name="targetWk">目标工作空间</param>
/// <param name="errlis">返回错误</param>
/// <returns></returns>
public static IFields ValidateFields(IFields fields, IWorkspace sourceWk, IWorkspace targetWk, out List<string> errlis)
{
    // Create the objects and references necessary for field validation.
    IFieldChecker fieldChecker = new FieldCheckerClass();
    IFields sourceFields = fields;
    IFields targetFields = null;
    IEnumFieldError enumFieldError = null;

    // Set the required properties for the IFieldChecker interface.
    fieldChecker.InputWorkspace = sourceWk;
    fieldChecker.ValidateWorkspace = targetWk;

    // Validate the fields and check for errors.
    fieldChecker.Validate(sourceFields, out enumFieldError, out targetFields);
    errlis = new List<string>();
    if (enumFieldError != null)
    {
        enumFieldError.Reset();
        IFieldError fiderr = null;
        while ((fiderr = enumFieldError.Next()) != null)
        {
            errlis.Add($"错误类型【{fiderr.FieldError}】,字段名【{fields.Field[fiderr.FieldIndex].Name}】别名【{fields.Field[fiderr.FieldIndex].AliasName}】");
        }
    }
    return targetFields;
}