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  • 将DataTable转换为List,将List转换为DataTable的实现类

     将DataTable转换为List,将List转换为DataTable的实现类

        public static class DataTableHelper
        {
            public static DataTable ConvertTo<T>(IList<T> list)
            {
                DataTable table = CreateTable<T>();
                Type entityType = typeof(T);
                PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(entityType);
                foreach (T item in list)
                {
                    DataRow row = table.NewRow();
                    foreach (PropertyDescriptor prop in properties)
                        row[prop.Name] = prop.GetValue(item);
                    table.Rows.Add(row);
                }
                return table;
            }
    
            public static IList<T> ConvertTo<T>(IList<DataRow> rows)
            {
                IList<T> list = null;
                if (rows != null)
                {
                    list = new List<T>();
                    foreach (DataRow row in rows)
                    {
                        T item = CreateItem<T>(row);
                        list.Add(item);
                    }
                }
                return list;
            }
    
            public static IList<T> ConvertTo<T>(DataTable table)
            {
                if (table == null)
                    return null;
    
                List<DataRow> rows = new List<DataRow>();
                foreach (DataRow row in table.Rows)
                    rows.Add(row);
    
                return ConvertTo<T>(rows);
            }
    
            //Convert DataRow into T Object
            public static T CreateItem<T>(DataRow row)
            {
                string columnName;
                T obj = default(T);
                if (row != null)
                {
                    obj = Activator.CreateInstance<T>();
                    foreach (DataColumn column in row.Table.Columns)
                    {
                        columnName = column.ColumnName;
                        //Get property with same columnName
                        PropertyInfo prop = obj.GetType().GetProperty(columnName);
                        try
                        {
                            //Get value for the column
                            object value = (row[columnName].GetType() == typeof(DBNull))
                            ? null : row[columnName];
                            //Set property value
                            if (prop.CanWrite)    //判断其是否可写
                                prop.SetValue(obj, value, null);
                        }
                        catch
                        {
                            throw;
                            //Catch whatever here
                        }
                    }
                }
                return obj;
            }
    
            public static DataTable CreateTable<T>()
            {
                Type entityType = typeof(T);
                DataTable table = new DataTable(entityType.Name);
                PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(entityType);
    
                foreach (PropertyDescriptor prop in properties)
                    table.Columns.Add(prop.Name, prop.PropertyType);
    
                return table;
            }
        }
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  • 原文地址:https://www.cnblogs.com/24la/p/datatable-list-converter.html
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