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如何動態地在C＃創建類和List，爲前：如果我們通過數據設置方法應該返回列表格式的數據如何動態地在C＃創建類和List
，但在傳統的模型每次我需要創建類和方法，所以任何有想法的人都可以分享它。
這是我的傳統方法代碼： -
[WebMethod]
public static List<ICF> ge_Grid_data(string paramstr, string procname)
{
#region
List<ICF> lst = new List<ICF>();
try
{
string[] parameters = paramstr.Split('~');
string err = string.Empty;
int len = parameters.Length;
SqlParameter[] sqlParam = new SqlParameter[len];
for (int i = 0; i < len; i++)
{
string[] paramWithValue = parameters[i].Split('$');
string param = paramWithValue[0].ToString();
string value = paramWithValue[1].ToString();
sqlParam[i] = new SqlParameter { ParameterName = param, Value = value };
}
DataSet ds = new clsiCMSBLBase().GetListData(ref err, sqlParam, procname);
DataTable dt = ds.Tables[0];
foreach (DataRow dr in dt.Rows)
{
ICF obj = new ICF();
obj.Flag = Convert.ToInt32(dr["Flag"]);
obj.ClaimID = dr["ClaimID"].ToString();
obj.RyotNumber = dr["RyotNumber"].ToString();
obj.SeasonCode = dr["SeasonCode"].ToString();
obj.PlotNumber = dr["PlotNumber"].ToString();
obj.RyotNumber = dr["RyotNumber"].ToString();
obj.RyotName = dr["RyotName"].ToString();
obj.ClaimDate = dr["ClaimDate"].ToString();
obj.ClaimFormNo = dr["ClaimFormNo"].ToString();
obj.ClaimArea = dr["ClaimArea"].ToString();
obj.ClaimAmount = dr["ClaimAmount"].ToString();
obj.ClaimReason = dr["ClaimReason"].ToString();
obj.SurveyorID = dr["SurveyorID"].ToString();
obj.SurveyorDate = dr["SurveyorDate"].ToString();
obj.InsuranceAmount = dr["InsuranceAmount"].ToString();
lst.Add(obj);
}
}
catch (Exception ex)
{
}
return lst;
#endregion
}
這裏是ICF類： -
public class ICF
{
#region
public int Flag { get; set; }
public string ClaimID { get; set; }
public string SeasonCode { get; set; }
public string PlotNumber { get; set; }
public string RyotNumber { get; set; }
public string RyotName { get; set; }
public string ClaimDate { get; set; }
public string ClaimFormNo { get; set; }
public string ClaimArea { get; set; }
public string ClaimAmount { get; set; }
public string ClaimReason { get; set; }
public string SurveyorID { get; set; }
public string SurveyorDate { get; set; }
public string InsuranceAmount { get; set; }
#endregion
}
我的意料：
public static class Extensions
{
/// <summary>
/// Converts datatable to list<T> dynamically
/// </summary>
/// <typeparam name="T">Class name</typeparam>
/// <param name="dataTable">data table to convert</param>
/// <returns>List<T></returns>
public static List<T> ToList<T>(this DataTable dataTable) where T : new()
{
var dataList = new List<T>();
//Define what attributes to be read from the class
const BindingFlags flags = BindingFlags.Public | BindingFlags.Instance;
//Read Attribute Names and Types
var objFieldNames = typeof(T).GetProperties(flags).Cast<PropertyInfo>().
Select(item => new
{
Name = item.Name,
Type = Nullable.GetUnderlyingType(item.PropertyType) ?? item.PropertyType
}).ToList();
//Read Datatable column names and types
var dtlFieldNames = dataTable.Columns.Cast<DataColumn>().
Select(item => new {
Name = item.ColumnName,
Type=item.DataType
}).ToList();
foreach (DataRow dataRow in dataTable.AsEnumerable().ToList())
{
var classObj = new T();
foreach (var dtField in dtlFieldNames)
{
PropertyInfo propertyInfos = classObj.GetType().GetProperty(dtField.Name);
var field = objFieldNames.Find(x => x.Name == dtField.Name);
if (field != null)
{
if (propertyInfos.PropertyType == typeof(DateTime))
{
propertyInfos.SetValue
(classObj, convertToDateTime(dataRow[dtField.Name]), null);
}
else if (propertyInfos.PropertyType == typeof(int))
{
propertyInfos.SetValue
(classObj, ConvertToInt(dataRow[dtField.Name]), null);
}
else if (propertyInfos.PropertyType == typeof(long))
{
propertyInfos.SetValue
(classObj, ConvertToLong(dataRow[dtField.Name]), null);
}
else if (propertyInfos.PropertyType == typeof(decimal))
{
propertyInfos.SetValue
(classObj, ConvertToDecimal(dataRow[dtField.Name]), null);
}
else if (propertyInfos.PropertyType == typeof(String))
{
if (dataRow[dtField.Name].GetType() == typeof(DateTime))
{
propertyInfos.SetValue
(classObj, ConvertToDateString(dataRow[dtField.Name]), null);
}
else
{
propertyInfos.SetValue
(classObj, ConvertToString(dataRow[dtField.Name]), null);
}
}
}
}
dataList.Add(classObj);
}
return dataList;
}
private static string ConvertToDateString(object date)
{
if (date == null)
return string.Empty;
return SpecialDateTime.ConvertDate(Convert.ToDateTime(date));
}
private static string ConvertToString(object value)
{
return Convert.ToString(HelperFunctions.ReturnEmptyIfNull(value));
}
private static int ConvertToInt(object value)
{
return Convert.ToInt32(HelperFunctions.ReturnZeroIfNull(value));
}
private static long ConvertToLong(object value)
{
return Convert.ToInt64(HelperFunctions.ReturnZeroIfNull(value));
}
private static decimal ConvertToDecimal(object value)
{
return Convert.ToDecimal(HelperFunctions.ReturnZeroIfNull(value));
}
private static DateTime convertToDateTime(object date)
{
return Convert.ToDateTime(HelperFunctions.ReturnDateTimeMinIfNull(date));
}
}
最後，我需要調用它像這樣：
List<MyClass> list = dt.ToList<MyClass>
但是這個代碼不工作
我不太清楚你問什麼，但你說的是自動映射？或者隨意輸入任意數據，您希望自動生成相應的cs類並使其成爲您解決方案的一部分？請問爲什麼要達到這個目的呢？ –
先解釋你的用例。看起來很奇怪，你想將一個通用模型映射到一個在運行中生成的強類型模型。 –
是自動映射，因爲每次我需要創建如此多的List方法返回List Data到HTML頁面，所以如果我有共同的List方法意味着可以再次減少開發 – ethiraj