using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Linq; using System.Reflection; using System.Text; using System.Threading.Tasks; namespace WCS_Client.Utility { /// /// 实体转换辅助类 /// public class ModelConvertHelper where T : new() { public static IList ConvertToModel(DataTable dt) { // 定义集合 IList ts = new List(); // 获得此模型的类型 Type type = typeof(T); string tempName = ""; foreach (DataRow dr in dt.Rows) { T t = new T(); // 获得此模型的公共属性 PropertyInfo[] propertys = t.GetType().GetProperties(); foreach (PropertyInfo pi in propertys) { tempName = pi.Name; // 检查DataTable是否包含此列 if (dt.Columns.Contains(tempName)) { // 判断此属性是否有Setter if (!pi.CanWrite) continue; object value = dr[tempName]; if (value != DBNull.Value) pi.SetValue(t, value, null); } } ts.Add(t); } return ts; } } /// /// Datatble转list /// public class DatatableConvertHelper { /// /// Convert a List{T} to a DataTable. /// public static DataTable ToDataTable(List items) { var tb = new DataTable(typeof(T).Name); PropertyInfo[] props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance); foreach (PropertyInfo prop in props) { Type t = GetCoreType(prop.PropertyType); tb.Columns.Add(prop.Name, t); } foreach (T item in items) { var values = new object[props.Length]; for (int i = 0; i < props.Length; i++) { values[i] = props[i].GetValue(item, null); } tb.Rows.Add(values); } return tb; } /// /// Determine of specified type is nullable /// private static bool IsNullable(Type t) { return !t.IsValueType || (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>)); } /// /// Return underlying type if type is Nullable otherwise return the type /// private static Type GetCoreType(Type t) { if (t != null && IsNullable(t)) { if (!t.IsValueType) { return t; } else { return Nullable.GetUnderlyingType(t); } } else { return t; } } public static DataTable ToDataTable(IEnumerable collection) { var props = typeof(T).GetProperties(); var dt = new DataTable(); dt.Columns.AddRange(props.Select(p => new DataColumn(p.Name, p.PropertyType)).ToArray()); if (collection.Count() > 0) { for (int i = 0; i < collection.Count(); i++) { ArrayList tempList = new ArrayList(); foreach (PropertyInfo pi in props) { object obj = pi.GetValue(collection.ElementAt(i), null); tempList.Add(obj); } object[] array = tempList.ToArray(); dt.LoadDataRow(array, true); } } return dt; } } }