在 WP7 上使用 C# 格式化 LINQ SQL CE 数据

Question

我对 C#/LINQ/WP7 开发非常陌生，并且正在努力格式化从 LINQ 查询返回的数据。

我有以下 LINQ c# 结构：

var boughtItemsInDB = from DBControl.MoneySpent bought in BoughtItemDB.BoughtItems
select bought;

BoughtItems = new ObservableCollection<DBControl.MoneySpent>(boughtItemsInDB);

MoneySpent 的定义如下；

    [Table(Name = "MoneySpent")]
    public class MoneySpent : INotifyPropertyChanged, INotifyPropertyChanging
    {
        // Define ID: private field, public property and database column.
        private int _itemId;

        [Column(IsPrimaryKey = true, IsDbGenerated = true, DbType = "INT NOT NULL Identity", CanBeNull = false, AutoSync = AutoSync.OnInsert)]
        public int ItemId
        {
            get
            {
                return _itemId;
            }
            set
            {
                if (_itemId != value)
                {
                    NotifyPropertyChanging("ItemId");
                    _itemId = value;
                    NotifyPropertyChanged("ItemId");
                }
            }
        }

        // Define item budget: private field, public property and database column.
        private int _itemBudget;

        [Column]
        public int ItemBudget
        {
            get
            {
                return _itemBudget;
            }
            set
            {
                if (_itemBudget != value)
                {
                    NotifyPropertyChanging("ItemBudget");
                    _itemBudget = value;
                    NotifyPropertyChanged("ItemBudget");
                }
            }
        }


        // Define item category: private field, public property and database column.
        private string _itemCategory;

        [Column]
        public string ItemCategory
        {
            get
            {
                return _itemCategory;
            }
            set
            {
                if (_itemCategory != value)
                {
                    NotifyPropertyChanging("ItemCategory");
                    _itemCategory = value;
                    NotifyPropertyChanged("ItemCategory");
                }
            }
        }



        // Define item description: private field, public property and database column.
        private string _itemDescription;

        [Column]
        public string ItemDescription
        {
            get
            {
                return _itemDescription;
            }
            set
            {
                if (_itemDescription != value)
                {
                    NotifyPropertyChanging("ItemDescription");
                    _itemDescription = value;
                    NotifyPropertyChanged("ItemDescription");
                }
            }
        }



        // Define item amount: private field, public property and database column.
        private decimal _itemAmount;

        [Column]
        public decimal ItemAmount
        {
            get
            {
                return _itemAmount;
            }
            set
            {
                if (_itemAmount != value)
                {
                    NotifyPropertyChanging("ItemAmount");
                    _itemAmount = value;
                    NotifyPropertyChanged("ItemAmount");
                }
            }
        }


        // Define item date: private field, public property and database column.
        private DateTime _itemDateTime;

        [Column]
        public DateTime ItemDateTime
        {
            get
            {
                return _itemDateTime;
            }
            set
            {
                if (_itemDateTime != value)
                {
                    NotifyPropertyChanging("ItemDateTime");
                    _itemDateTime = value;
                    NotifyPropertyChanged("ItemDateTime");
                }
            }
        }

我需要格式化从数据库返回的数据，以下内容存储在我的数据库中：

ItemDateTime - DateTime、ItemDescription - String、ItemAmount - Decimal

我需要能够根据用户的当前区域设置格式化日期，并且将小数点格式设置为 2 dp。

我也不确定在获取数据结果时是否需要使用 IQueryable 。

任何帮助将不胜感激。

谢谢， 标记

Answer 1

由于您没有提供足够的详细信息 - 只是一个一般想法

var boughtItemsInDB = from bought in BoughtItemDB.BoughtItems
select new { ItemDateTime = bought.ItemDateTime.ToString(), ItemDescription = bought.ItemDescription, ItemAmount = bought.ItemAmount.ToString("0,0.00") };

，但格式化最好在用于显示数据的控件中完成，而不是在 Linq 查询中...

编辑 - 添加 frm OP 之后：

据我所知，MoneySpent 类已经为“数据绑定”做好了准备...

因此格式化应该在显示控件中完成...有关一些信息，请参阅：

• 什么是 WPF XAML 数据绑定等效项String.Format 的？
• http://www.codeproject.com/KB/WPF/binding_in_linq-sql.aspx
• http://odetocode.com/code/740.aspx
• http://www.codeguru.com/csharp/.net/wp7/文章.php/c18933