Dataset,DataTable

private void BiudTree()
{
MmyeeAd.BLL.ADManage.AdClass bll = new MmyeeAd.BLL.ADManage.AdClass();
DataTable dt = bll.GetAllList().Tables[0];
this.dropParent.Items.Clear();
//加载树
this.dropParent.Items.Add(new ListItem("顶级目录", "0"));
DataRow[] drs = dt.Select("ParentId= 0");
foreach (DataRow r in drs)
{
string nodeid = r["ClassId"].ToString();
string text = r["ClassDesc"].ToString();
string parentid = r["ParentId"].ToString();
text = "╋" + text;
this.dropParent.Items.Add(new ListItem(text, nodeid));
int sonparentid = int.Parse(nodeid);
string blank = "├";
BindNode(sonparentid, dt, blank);
}
this.dropParent.DataBind();

}
private void BindNode(int parentid, DataTable dt, string blank)
{
DataRow[] drs = dt.Select("ParentID= " + parentid);

foreach (DataRow r in drs)
{
string nodeid = r["ClassId"].ToString();
string text = r["ClassDesc"].ToString();
text = blank + "『" + text + "』";
this.dropParent.Items.Add(new ListItem(text, nodeid));
int sonparentid = int.Parse(nodeid);
string blank2 = blank + "─";

BindNode(sonparentid, dt, blank2);
}
}

public DataTable test(int id) {

var dt = GetLanguageDataTable(pfAppId);
dt.AsEnumerable().ToList().ForEach(p => { mm m = new mm(); var lang = p.Field<string>("languageName"); p.SetField<string>("languageName", m.GetProperLanguage(lang)); });
return dt;
}

var path = Server.MapPath("~/App_Data/ff.txt");
var invalidEMails = MailHelper.GetInvalidEMailList(path);
dt.AsEnumerable().ToList().ForEach(p => {
var email = p.Field<string>("ff");
if (invalidEMails.FirstOrDefault(w => w.ToLower() == email.ToLower())!=null) {
dt.Rows.Remove(p);
}
});

DataTable dts；
DataRow[] foundRow;
foundRow = dts.Select("ID=99", "");
foreach (DataRow row in foundRow)
{
dts.Rows.Remove(row);

public class HomeController : BaseController {
public class Student {
public int StudentId { get; set; }
public string StudentName { get; set; }
public string Address { get; set; }
public string MobileNo { get; set; }
public int? Status { get; set; }
}
public static List<T> ConvertDataTableToList<T>(DataTable dt) {
List<T> data = new List<T>();
foreach (DataRow row in dt.Rows) {
T item = GetItem<T>(row);
data.Add(item);
}
return data;
}
private static T GetItem<T>(DataRow dr) {
Type temp = typeof(T);
T obj = Activator.CreateInstance<T>();

foreach (DataColumn column in dr.Table.Columns) {
foreach (PropertyInfo pro in temp.GetProperties()) {
if (pro.Name == column.ColumnName){
var propertyValue = dr[column.ColumnName];
//pro.SetValue(obj, dr[column.ColumnName], null);
if (!pro.PropertyType.IsGenericType) {
pro.SetValue(obj, propertyValue == DBNull.Value ? null : Convert.ChangeType(propertyValue, pro.PropertyType));
} else {
Type genericTypeDefinition = pro.PropertyType.GetGenericTypeDefinition();
if (genericTypeDefinition == typeof(Nullable<>)) {
pro.SetValue(obj, propertyValue==DBNull.Value ? null : Convert.ChangeType(propertyValue, Nullable.GetUnderlyingType(pro.PropertyType)));
}
}
}
else
continue;
}
}
return obj;
}

public DataTable GetDataTable() {
DataTable dt = new DataTable("Student");
dt.Columns.Add("StudentId", typeof(Int32));
dt.Columns.Add("StudentName", typeof(string));
dt.Columns.Add("Address", typeof(string));
dt.Columns.Add("MobileNo", typeof(string));
dt.Columns.Add("Status", typeof(Int32));
//Data
dt.Rows.Add(1, "Manish", "Hyderabad","0000000000");
dt.Rows.Add(2, "Venkat", "Hyderabad", "111111111");
dt.Rows.Add(3, "Namit", "Pune", "1222222222");
dt.Rows.Add(4, "Abhinav", "Bhagalpur", "3333333333",1);

return dt;
}

public DataSet GetDatasets() {

DataSet dsClass = new DataSet();
//创建班级表
DataTable dtClass = new DataTable("Class");
//创建班级名称列
DataColumn dcClassName = new DataColumn("ClassName",typeof(string));
dcClassName.MaxLength = 50;
//创建年级ID列
DataColumn dcGradeID = new DataColumn("GradeID",typeof(int));
//将定义好列添加到班级表中
dtClass.Columns.Add(dcClassName);
dtClass.Columns.Add(dcGradeID);
//创建一个新的数据行
DataRow drClass = dtClass.NewRow();
drClass["className"] = "1";
drClass["gradeID"] = 1;
//将新的数据行插入班级表中
dtClass.Rows.Add(drClass);
//将班级表添加到DataSet中
dsClass.Tables.Add(dtClass);
return dsClass;
}

public ActionResult Load() {

var dt = GetDataTable();
List<Student> target = dt.AsEnumerable()
.Select(dataRow => new Student {
StudentName = dataRow.Field<string>("StudentName"),
Status = dataRow.Field<int?>("Status")
}).ToList();

var empList = dt.AsEnumerable().Select(dataRow => new Student {
StudentName = dataRow.Field<string>("StudentName"),
Status = dataRow.Field<int?>("Status")
}).ToList();

List<Student> studentList = new List<Student>();

for (int i = 0; i < dt.Rows.Count; i++) {
Student student = new Student();
student.StudentId = Convert.ToInt32(dt.Rows[i]["StudentId"]);
student.StudentName = dt.Rows[i]["StudentName"].ToString();
student.Address = dt.Rows[i]["Address"].ToString();
student.MobileNo = dt.Rows[i]["MobileNo"].ToString();
studentList.Add(student);
}

//studentList = (from DataRow dr in dt.Rows
// select new Student() {
// StudentId = Convert.ToInt32(dr["StudentId"]),
// StudentName = dr["StudentName"].ToString(),
// Address = dr["Address"].ToString(),
// MobileNo = dr["MobileNo"].ToString()
// }).ToList();

var result2 = BaseResponseEntity.Success(new { StudentList1 = GetDatasets(),StudentList = GetDatasets().Tables[0] });
return JsonContentResult(result2);

var result1 = BaseResponseEntity.Success(new { StudentList = dt });
return JsonContentResult(result1);

studentList = ConvertDataTableToList<Student>(dt);
var result = BaseResponseEntity.Success(new { StudentList=studentList});
//return JsonContentResult(studentList);
return JsonContentResult(result);
}

public ActionResult Index() {
return View();
}

public ActionResult About() {
ViewBag.Message = "Your application description page.";

return View();
}

public ActionResult Contact() {
ViewBag.Message = "Your contact page.";

return View();
}
}

http://www.c-sharpcorner.com/UploadFile/ee01e6/different-way-to-convert-datatable-to-list/

http://www.cnblogs.com/envelope/archive/2010/04/20/1716343.html

https://www.cnblogs.com/sky-net/p/5956538.html