最近学习到ITable与DataTable是不能够强制转换的，ITable类型的表在代码中无法转换成DataTable类型，代码会提示错误“无法强制转换”；DataTable类型在代码中可以转换成ITable不会报错，但是表为空null。
后来看到了这一篇博客，才知道相互转换的方法，果断转了。值得学习！
转自：https://blog.csdn.net/Prince999999/article/details/79813043
/// <summary>
/// 打开dbf表
/// </summary>
/// <param name="pathName"></param>
/// <param name="tableName"></param>
/// <returns></returns>
public static ITable OpenTable(string pathName, string tableName)
{
// Create the workspace name object.
IWorkspaceName workspaceName = new WorkspaceNameClass();
workspaceName.PathName = pathName;
workspaceName.WorkspaceFactoryProgID = "esriDataSourcesFile.shapefileworkspacefactory";
// Create the table name object.
IDatasetName dataSetName = new TableNameClass();
dataSetName.Name = tableName;
dataSetName.WorkspaceName = workspaceName;
// Open the table.
IName name = (IName)dataSetName;
ITable table = (ITable)name.Open();
return table;
}
/// <summary>
/// 将ITable转换为DataTable
/// </summary>
/// <param name="mTable"></param>
/// <returns></returns>
public static DataTable ToDataTable(ITable mTable)
{
try
{
DataTable pTable = new DataTable();
for (int i = 0; i < mTable.Fields.FieldCount; i++)
{
pTable.Columns.Add(mTable.Fields.get_Field(i).Name);
}
ICursor pCursor = mTable.Search(null, false);
IRow pRrow = pCursor.NextRow();
while (pRrow != null)
{
DataRow pRow = pTable.NewRow();
string[] StrRow = new string[pRrow.Fields.FieldCount];
for (int i = 0; i < pRrow.Fields.FieldCount; i++)
{
StrRow[i] = pRrow.get_Value(i).ToString();
}
pRow.ItemArray = StrRow;
pTable.Rows.Add(pRow);
pRrow = pCursor.NextRow();
}
return pTable;
}
catch (Exception ex)
{
return null;
}
}
/// <summary>
/// 把DataTable转为ITable ,tempPath 不含文件名的问价夹路径
/// </summary>
/// <param name="mTable"></param>
/// <returns></returns>
public static ITable ToITable(DataTable mTable,string tempPath)
{
try
{
#region 新建表字段
IField pField = null;
IFields fields = new FieldsClass();
IFieldsEdit fieldsEdit = (IFieldsEdit)fields;
fieldsEdit.FieldCount_2 = 3;
pField = new FieldClass();
IFieldEdit fieldEdit = (IFieldEdit)pField;
fieldEdit.Name_2 = "FromField";
fieldEdit.AliasName_2 = "开始字段值";
fieldEdit.Type_2 = esriFieldType.esriFieldTypeDouble;
fieldEdit.Editable_2 = true;
//添加开始字段
fieldsEdit.set_Field(0, pField);
IField pField1 = new FieldClass();
IFieldEdit fieldEdit1 = (IFieldEdit)pField1;
fieldEdit1.Name_2 = "ToField";
fieldEdit1.AliasName_2 = "结束字段值";
fieldEdit1.Type_2 = esriFieldType.esriFieldTypeDouble;
fieldEdit1.Editable_2 = true;
//添加结束字段
fieldsEdit.set_Field(1, pField1);
IField pField2 = new FieldClass();
IFieldEdit fieldEdit2 = (IFieldEdit)pField2;
fieldEdit2.Name_2 = "outField";
fieldEdit2.AliasName_2 = "分类字段值";
fieldEdit2.Type_2 = esriFieldType.esriFieldTypeDouble;
fieldEdit2.Editable_2 = true;
//添加重分类字段
fieldsEdit.set_Field(2, pField2);
#endregion
ShapefileWorkspaceFactoryClass class2 = new ShapefileWorkspaceFactoryClass();
ESRI.ArcGIS.Geodatabase.IWorkspace pWorkspace = class2.OpenFromFile(tempPath, 0);
IFeatureWorkspace pFWS = pWorkspace as IFeatureWorkspace;
//删除已有的
if (System.IO.File.Exists(tempPath + "重分类.dbf"))
{
System.IO.File.Delete(tempPath + "重分类.dbf");
}
//创建空表
ESRI.ArcGIS.Geodatabase.ITable pTable;
pTable = pFWS.CreateTable("重分类", fieldsEdit, null, null, "");
//获取表中记录数
int count=mTable .Rows .Count ;
//转换为ITable中的数据
for(int k=0;k<count ;k++)
{
//ITable 的记录
IRow row = pTable.CreateRow();
DataRow pRrow=mTable .Rows[k];
//列元素
int rowNum= pRrow .ItemArray.Length;
// 添加记录
for (int n=1;n<rowNum+1 ;n++)
{
row.set_Value(n,pRrow.ItemArray.GetValue(n-1));
row.Store ();
}
}
return pTable ;
}
catch (Exception ex)
{
return null;
}
}
/// <summary>
///保存DataTable表位DBF ,tempPath 文件完整路径
/// </summary>
/// <param name="mTable"></param>
/// <returns></returns>
public static bool SaveTable(DataTable mTable, string tempPath)
{
try
{
#region 新建表字段
IField pField = null;
IFields fields = new FieldsClass();
IFieldsEdit fieldsEdit = (IFieldsEdit)fields;
fieldsEdit.FieldCount_2 = 3;
pField = new FieldClass();
IFieldEdit fieldEdit = (IFieldEdit)pField;
fieldEdit.Name_2 = "FromField";
fieldEdit.AliasName_2 = "开始字段值";
fieldEdit.Type_2 = esriFieldType.esriFieldTypeDouble;
fieldEdit.Editable_2 = true;
//添加开始字段
fieldsEdit.set_Field(0, pField);
IField pField1 = new FieldClass();
IFieldEdit fieldEdit1 = (IFieldEdit)pField1;
fieldEdit1.Name_2 = "ToField";
fieldEdit1.AliasName_2 = "结束字段值";
fieldEdit1.Type_2 = esriFieldType.esriFieldTypeDouble;
fieldEdit1.Editable_2 = true;
//添加结束字段
fieldsEdit.set_Field(1, pField1);
IField pField2 = new FieldClass();
IFieldEdit fieldEdit2 = (IFieldEdit)pField2;
fieldEdit2.Name_2 = "outField";
fieldEdit2.AliasName_2 = "分类字段值";
fieldEdit2.Type_2 = esriFieldType.esriFieldTypeDouble;
fieldEdit2.Editable_2 = true;
//添加重分类字段
fieldsEdit.set_Field(2, pField2);
#endregion
string path = System.IO.Path.GetDirectoryName(tempPath);
string fileName = System.IO.Path.GetFileName(tempPath);
ShapefileWorkspaceFactoryClass class2 = new ShapefileWorkspaceFactoryClass();
ESRI.ArcGIS.Geodatabase.IWorkspace pWorkspace = class2.OpenFromFile(path, 0);
IFeatureWorkspace pFWS = pWorkspace as IFeatureWorkspace;
//删除已有的
if (System.IO.File.Exists(tempPath))
{
System.IO.File.Delete(tempPath);
}
fileName = fileName.Split('.')[0];
//创建空表
ESRI.ArcGIS.Geodatabase.ITable pTable;
pTable = pFWS.CreateTable(fileName, fieldsEdit, null, null, "");
//获取表中记录数
int count = mTable.Rows.Count;
//转换为ITable中的数据
for (int k = 0; k < count; k++)
{
//ITable 的记录
IRow row = pTable.CreateRow();
DataRow pRrow = mTable.Rows[k];
//列元素
int rowNum = pRrow.ItemArray.Length;
// 添加记录
for (int n = 1; n < rowNum + 1; n++)
{
row.set_Value(n, pRrow.ItemArray.GetValue(n - 1));
row.Store();
}
}
return true ;
}
catch (Exception ex)
{
return false ;
}
}