(转载)DevExpress ASPxGridView 使用文档四：数据源

转载请注明出处：http://surfsky.cnblogs.com/

---------------------------------------------------------
-- DataSource 支持的数据源
--     DataTable
--     IList
--     BindingList
--     XXXDataSource
---------------------------------------------------------
DataTable
    grid.DataSource = dt;
    grid.DataBind();
    
IList
    int articleId = Convert.ToInt32(Request.QueryString["articleId"]);
    IList<BlogArticleImage> images = BlogArticleImage.ListArticleImages(articleId);
    this.gvImages.KeyFieldName = "ImageId";
    this.gvImages.DataSource = images;
    this.gvImages.DataBind();

BindingList
    private void CreateQuotes() 
    {
        BindingList<Quote> res = new BindingList<Quote>();
        foreach(string name in names) 
        {
            Quote q = new Quote(name);
            q.Value = (decimal)GetRandom().Next(800, 2000) / (decimal)10;
            res.Add(q);
        }
        Session["Quotes"] = res;
    }

AccessDataSource
    <asp:AccessDataSource ID="AccessDataSource1" runat="server" DataFile="~/App_Data/nwind.mdb"
        SelectCommand="SELECT * FROM [Customers]" 
        DeleteCommand="DELETE FROM [Customers] WHERE [CustomerID] = ?" 
        InsertCommand="INSERT INTO [Customers] ([CustomerID], [CompanyName], [ContactName], [ContactTitle], [Address], [City], [Region], [PostalCode], [Country], [Phone], [Fax]) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)" 
        UpdateCommand="UPDATE [Customers] SET [CompanyName] = ?, [ContactName] = ?, [ContactTitle] = ?, [Address] = ?, [City] = ?, [Region] = ?, [PostalCode] = ?, [Country] = ?, [Phone] = ?, [Fax] = ? WHERE [CustomerID] = ?"
        />
    <asp:AccessDataSource ID="AccessDataSource1" runat="server" DataFile="~/App_Data/nwind.mdb" 
        OnDeleting="AccessDataSource1_Modifying" OnInserting="AccessDataSource1_Modifying" OnUpdating="AccessDataSource1_Modifying"
        SelectCommand="SELECT * FROM [Customers]" DeleteCommand="DELETE FROM [Customers] WHERE [CustomerID] = ?" 
        InsertCommand="INSERT INTO [Customers] ([CustomerID], [CompanyName], [ContactName], [ContactTitle], [Address], [City], [Region], [PostalCode], [Country], [Phone], [Fax]) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)" 
        UpdateCommand="UPDATE [Customers] SET [CompanyName] = ?, [ContactName] = ?, [City] = ?, [Region] = ?, [Country] = ? WHERE [CustomerID] = ?">
        <DeleteParameters>
            <asp:Parameter Name="CustomerID" Type="String" />
        </DeleteParameters>
        <UpdateParameters>
            <asp:Parameter Name="CompanyName" Type="String" />
            <asp:Parameter Name="ContactName" Type="String" />
            <asp:Parameter Name="City" Type="String" />
            <asp:Parameter Name="Region" Type="String" />
            <asp:Parameter Name="Country" Type="String" />
        </UpdateParameters>
    </asp:AccessDataSource>
    protected void AccessDataSource1_Modifying(object sender, SqlDataSourceCommandEventArgs e) {
       DemoSettings.AssertNotReadOnly();
    }
    用代码实现
        AccessDataSource ds = new AccessDataSource();
        ds.DataFile = AccessDataSource1.DataFile;
        ds.SelectCommand = "select Photo from [Employees] where employeeid=" + id;
        DataView view = (DataView)ds.Select(DataSourceSelectArguments.Empty);
        if(view.Count > 0) return view[0][0] as byte[];
        return null;

ObjectDataSource
    <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" 
        TypeName="Quotes"
        SelectMethod="LoadQuotes" 
        />
    <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" 
        DataObjectTypeName="PersonRegistration"
        TypeName="MyPersonProvider" 
        SelectMethod="GetList" UpdateMethod="Update" InsertMethod="Insert"
        />
    <asp:objectDataSource id="ObjectDataSource1" runat="server"
        typename="PersonManager"
        selectMethod="SelectPersons"
        deleteMethod="DeletePerson"
        updateMethod="UpdatePerson"
        insertMethod="InsertPerson" >
        <insertParameters>
            <asp:parameter name="Id" type="Int32" />
        </insertParameters>
    </asp:objectDataSource>
    
ObjectDataSource.Parameters
    <SelectParameters> 
        <asp:SessionParameter Name="IGYSID" SessionField="ID" Type="Int32" /> 
        <asp:SessionParameter DefaultValue="0" Name="ICGFS" SessionField="ICGFS" Type="Int32" /> 
    </SelectParameters> 
    <UpdateParameters> 
        <asp:Parameter Name="IWZID" /> 
        <asp:Parameter Name="IGYSID" /> 
        <asp:Parameter Name="ICGMXID" /> 
        <asp:Parameter Name="IGYSBJID" /> 
        <asp:Parameter Name="NBJ" /> 
        <asp:Parameter Name="CBZ" /> 
    </UpdateParameters> 
    <UpdateParameters>
        <asp:FormParameter FormField="makeid" Name="MakeID" Type="String" />
        <asp:FormParameter FormField="name" Name="Name" Type="String" />
        <asp:FormParameter FormField="id" Name="ID" Type="String" ConvertEmptyStringToNull="False" />
    </UpdateParameters>

ObjectDataSource 使用的类
    (以下代码整理并修改至《ASP.NET 2.0 Revealed》P71-P78)
    (另外一个购物篮的例子，参考P138)
    public class Person
    {
        private int id;
        private string firstName;
        private string lastName;

        public int Id {...}
        public string FirstName {...}
        public string LastName {...}
        
        public Person(int id, string firstName, string lastName)
        {
            this.id = id;
            this.firstName = firstName;
            this.lastName = lastName;
        }
    }
    public class PersonCollection : List<Person> {}
    public class PersonManager
    {
        private const string personsKey = "persons";
        
        public PersonCollection SelectPersons()
        {
            HttpContext context = HttpContext.Current;
            if (context.Application[personKey] == null)
            {
                PersonCollection persons = new PersonCollection();
                persons.Add(new Person(0, "Patrick", "Lorenz"));
                persons.Add(new Person(0, "Patrick", "Lorenz"));
                persons.Add(new Person(0, "Patrick", "Lorenz"));
                persons.Add(new Person(0, "Patrick", "Lorenz"));
                context.Application[personKey] = persons;
            }
            return context.Application[personKey] as PersonCollection;
        }
        
        public Person SelectPerson(int id)
        {
            foreach (Person p in SelectPersons())
                if (p.Id == id)
                    return p;   
            return null;
        }
        
        public void DeletePerson(int id)
        {
            PersonCollection persons = (Application[personKey] as PersonCollections);
            Person person = SelectPerson(id);
            if (person != null)
                persons.Remove(person);
        }
        
        public void InsertPerson(int id, string firstName, string lastName)
        {
            PersonCollection persons = (Application[personKey] as PersonCollections);
            persons.Add(new Person(id, firstName, lastName));
        }
        
        public void UpdatePerson(int id, string firstName, string lastName)
        {
            Person person = SelectPerson(id);
            if (person != null)
            {
                person.FirstName = firstName;
                person.LastName = lastName;
            }
        }
    }