AE DataTable转换为ITable(内存工作空间中)

Posted 2020-11-27 songqingguo

 

 public static ITable ToITable(DataTable mTable)
        {
            try
            {
                #region 新建表字段
                IFields fields = new FieldsClass();
                IFieldsEdit fieldsEdit = (IFieldsEdit)fields;

                for (int i = 0; i < mTable.Columns.Count; i++)
                {
                    IField pField = new FieldClass();
                    IFieldEdit fieldEdit = (IFieldEdit)pField;
                    fieldEdit.Name_2 = mTable.Columns[i].ColumnName;
                    fieldEdit.AliasName_2 = mTable.Columns[i].ColumnName; 
                    //这里根据实际情况设置 
                    if (i == 0)
                    {
                        fieldEdit.Type_2 = esriFieldType.esriFieldTypeOID;
                    }
                    else
                    {
                        fieldEdit.Type_2 = esriFieldType.esriFieldTypeDouble;
                    }
                    fieldEdit.Editable_2 = true;
                    fieldsEdit.AddField(pField);
                }
                #endregion
                  
                // 实例化内存工作空间工厂
                IWorkspaceFactory workspaceFactory = new InMemoryWorkspaceFactoryClass();
            
                // 创建内存工作空间
                IWorkspaceName workspaceName = workspaceFactory.Create("", "MyWorkspace", null, 0);
                IName name = (IName)workspaceName;

                // 通过name对象打开工作空间
                IWorkspace workspace = (IWorkspace)name.Open();
                IFeatureWorkspace pFWS = workspace as IFeatureWorkspace;

                //创建空表  
                ITable pTable = pFWS.CreateTable("tempTable", fieldsEdit, null, null, "");

                //获取DataTble中记录的数  
                int count = mTable.Rows.Count;
                //转换为ITable中的数据  
                for (int i = 0; i < count; i++)
                {
                    //在ITable中创建新纪录；获取DataTble中的记录
                    IRow row = pTable.CreateRow();
                    DataRow pRrow = mTable.Rows[i];

                    //列总数
                    int rowNum = pRrow.ItemArray.Length;

                    // 添加记录  
                    for ( int j = 1; j < rowNum ; j++)
                    {
                        row.set_Value(j, pRrow.ItemArray.GetValue(j));
                        row.Store();
                    }
                }
                return pTable;
            }
            catch (Exception ex)
            {
                return null;
            }
        }            

补充：在开发中发现，内存中的ITable无法作为参数传递给“连接字段”GP工具，会报错：传递的参数不是表。如果用IGPUtilities接口的MakeGPTableView方法生成IGPTableView再传递给“连接字段”GP工具时，会报错：Error 000732：数据集×××不存在或不被支持。