AE创建一个空白的Shapefile

1.IField和IFieldEdit区别： 

IFieldEdit是继承IField的，因为IField的属性大部分是只读的（read-only），所以IFieldEdit就在IField的基础上多了个只写的属性。这也是为什么会出现Name_2、Length_2等原因了。IFields和IFieldsEdit的区别也是如此。

2.IField和IFields区别

IFields是IField的集合，通过AddField()方法或者set_Field()方法添加Field，其中set_Field通过index可以在指定的位置添加Field;

/// <summary>
/// 在指定路径下创建一个指定名字的空Shapefile
/// </summary>
/// <param name="strShapeFolder">指定路径</param>
/// <param name="strShapeName">文件名</param>

        public void CreateShapefile(string strShapeFolder，string strShapeName )
        {
            //打开工作空间
            const string strShapeFieldName = "shape";
            IWorkspaceFactory pWSF = new ShapefileWorkspaceFactoryClass();
            IFeatureWorkspace pWS = (IFeatureWorkspace)pWSF.OpenFromFile(strShapeFolder,0); 

            //设置字段集
            IFields pFields = new FieldsClass();
            IFieldsEdit pFieldsEdit = (IFieldsEdit)pFields;

            //设置字段
            IField pField = new FieldClass();
            IFieldEdit pFieldEdit = (IFieldEdit)pField;

            //创建类型为几何类型的字段
            pFieldEdit.Name_2 = strShapeFieldName;
            pFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;
            
            //为esriFieldTypeGeometry类型的字段创建几何定义，包括类型和空间参照 
            IGeometryDef pGeoDef = new GeometryDefClass();     //The geometry definition for the field if IsGeometry is TRUE.
            IGeometryDefEdit pGeoDefEdit = (IGeometryDefEdit)pGeoDef;
            pGeoDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint;
            pGeoDefEdit.SpatialReference_2 = new UnknownCoordinateSystemClass();

            pFieldEdit.GeometryDef_2 = pGeoDef;
            pFieldsEdit.AddField(pField);

            //添加其他的字段
            pField = new FieldClass();
            pFieldEdit = (IFieldEdit)pField;
            pFieldEdit.Name_2 = "WaterLevel";
            pFieldEdit.Type_2 = esriFieldType.esriFieldTypeDouble;
            pFieldEdit.Precision_2 = 7;//数值精度
            pFieldEdit.Scale_2 = 3;//小数点位数
            pFieldsEdit.AddField(pField);

            //创建shapefile
            pWS.CreateFeatureClass(strShapeName,pFields,null,null,esriFeatureType.esriFTSimple,strShapeFieldName,"");
        }