DevExpress ASPxGridView 使用文档四：数据源

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---------------------------------------------------------

-- 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;

}

}

}