本文整理汇总了C#中System.Web.UI.Design.DataSourceDesigner类的典型用法代码示例。如果您正苦于以下问题:C# DataSourceDesigner类的具体用法?C# DataSourceDesigner怎么用?C# DataSourceDesigner使用的例子?那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
DataSourceDesigner类属于System.Web.UI.Design命名空间,在下文中一共展示了DataSourceDesigner类的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于我们的系统推荐出更棒的C#代码示例。
示例1: ToolboxData
//引入命名空间
using System;
using System.Data;
using System.Security.Permissions;
using System.Collections;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.Design;
using System.Web.UI.Design.WebControls;
using System.ComponentModel;
using System.ComponentModel.Design;
namespace ASPNet.Design.Samples_CS
{
[Designer(typeof(CustomDataSourceDesigner)),
ToolboxData("<{0}:CustomDataSource runat=\"server\"></{0}:CustomDataSource>")]
public class CustomDataSource : ObjectDataSource
{
private ObjectDataSourceView _view = null;
private string _defaultViewName = "BookList";
public CustomDataSource() : base() { }
// Gets a view by name
protected override DataSourceView GetView(string viewName)
{
// This data source only allows one view
if (viewName != _defaultViewName)
{
return null;
}
else if (_view == null)
{
_view = new CustomDataSourceView(this,
_defaultViewName, HttpContext.Current);
}
return _view;
}
// Gets a list of view names for this class
protected override ICollection GetViewNames()
{
ArrayList ar = new ArrayList(1);
ar.Add(_defaultViewName);
return ar as ICollection;
}
}
// The runtime data source view
public class CustomDataSourceView : ObjectDataSourceView
{
private ArrayList _data = null;
public CustomDataSourceView(CustomDataSource owner,
string viewName, HttpContext context)
: base(owner, viewName, context)
{
owner.SelectCountMethod = "GetCount";
}
// This method would typically get a set of live data
// rather than create some dummy data
protected override IEnumerable ExecuteSelect(
DataSourceSelectArguments arguments)
{
if (_data == null)
{
// Create a set of runtime fake data
_data = new ArrayList();
_data.Add(new BookItem("ID_1", "Runtime Title 01"));
_data.Add(new BookItem("ID_2", "Runtime Title 02"));
_data.Add(new BookItem("ID_3", "Runtime Title 03"));
}
return _data as IEnumerable;
}
// Allow getting the record count
public override bool CanRetrieveTotalRowCount
{
get { return true; }
}
// Returns the number of records in the current set of data
public int GetCount()
{
if (_data == null)
return 0;
else
return _data.Count;
}
// Do not allow deletions
public override bool CanDelete
{
get { return false; }
}
// Do not allow insertions
public override bool CanInsert
{
get { return false; }
}
// Do not allow paging
public override bool CanPage
{
get { return false; }
}
// Do not allow sorting
public override bool CanSort
{
get { return false; }
}
// Do not allow updating
public override bool CanUpdate
{
get { return false; }
}
}
// A class to define each record of the data
public class BookItem
{
private string _id;
private string _title;
public BookItem(string id, string title)
{
_id = id;
_title = title;
}
public string ID
{
get { return _id; }
}
public string Title
{
get { return _title; }
set { _title = value; }
}
}
// Custom designer for the CustomDataSource control.
public class CustomDataSourceDesigner : DataSourceDesigner
{
private CustomDataSource _control;
private string _defaultViewName = "BookList";
private CustomDesignDataSourceView _view = null;
// Initialize the designer
public override void Initialize(IComponent component)
{
base.Initialize(component);
_control = (CustomDataSource)Component;
}
// Get a view
public override DesignerDataSourceView GetView(string viewName)
{
if (!viewName.Equals(_defaultViewName))
return null;
_view ??= new CustomDesignDataSourceView(this,
_defaultViewName);
return _view;
}
// Get a list of view names
public override string[] GetViewNames()
{
return new string[] { "BookList" };
}
// Do not allow refreshing the schema
public override bool CanRefreshSchema
{
get { return false; }
}
// Do not allow resizing
public override bool AllowResize
{
get { return false; }
}
}
// A design-time data source view
public class CustomDesignDataSourceView : DesignerDataSourceView
{
private ArrayList _data = null;
public CustomDesignDataSourceView(
CustomDataSourceDesigner owner, string viewName)
: base(owner, viewName)
{}
// Get data for design-time display
public override IEnumerable GetDesignTimeData(
int minimumRows, out bool isSampleData)
{
if (_data == null)
{
// Create a set of design-time fake data
_data = new ArrayList();
for (int i = 1; i <= minimumRows; i++)
{
_data.Add(new BookItem("ID_" + i.ToString(),
"Design-Time Title 0" + i.ToString()));
}
}
isSampleData = true;
return _data as IEnumerable;
}
public override IDataSourceViewSchema Schema
{
get { return new BookListViewSchema(); }
}
// Allow getting the record count
public override bool CanRetrieveTotalRowCount
{
get { return true; }
}
// Do not allow deletions
public override bool CanDelete
{
get { return false; }
}
// Do not allow insertions
public override bool CanInsert
{
get { return false; }
}
// Do not allow updates
public override bool CanUpdate
{
get { return false; }
}
// Do not allow paging
public override bool CanPage
{
get { return false; }
}
// Do not allow sorting
public override bool CanSort
{
get { return false; }
}
}
// A custom View Schema class
public class BookListViewSchema : IDataSourceViewSchema
{
public BookListViewSchema()
{ }
// The name of this View Schema
public string Name
{
get { return "BookList"; }
}
// Build a Field Schema array
public IDataSourceFieldSchema[] GetFields()
{
IDataSourceFieldSchema[] fields = new IDataSourceFieldSchema[2];
fields[0] = new CustomIDFieldSchema();
fields[1] = new CustomTitleFieldSchema();
return fields;
}
// There are no child views, so return null
public IDataSourceViewSchema[] GetChildren()
{
return null;
}
}
// A custom Field Schema class for ID
public class CustomIDFieldSchema : IDataSourceFieldSchema
{
public CustomIDFieldSchema()
{ }
// Name is ID
public string Name
{
get { return "ID"; }
}
// Data type is string
public Type DataType
{
get { return typeof(string); }
}
// This is not an Identity field
public bool Identity
{
get { return false; }
}
// This field is read only
public bool IsReadOnly
{
get { return true; }
}
// This field is unique
public bool IsUnique
{
get { return true; }
}
// This field can't be longer than 20
public int Length
{
get { return 20; }
}
// This field can't be null
public bool Nullable
{
get { return false; }
}
// This is a Primary Key
public bool PrimaryKey
{
get { return true; }
}
// These properties do not apply
public int Precision
{
get { return -1; }
}
public int Scale
{
get { return -1; }
}
}
// A custom Field Schema class for Title
public class CustomTitleFieldSchema : IDataSourceFieldSchema
{
public CustomTitleFieldSchema()
{ }
// Name is Title
public string Name
{
get { return "Title"; }
}
// Type is string
public Type DataType
{
get { return typeof(string); }
}
// This is not an Identity field
public bool Identity
{
get { return false; }
}
// This field is not read only
public bool IsReadOnly
{
get { return false; }
}
// This field is not unique
public bool IsUnique
{
get { return false; }
}
// This field can't be longer than 100
public int Length
{
get { return 100; }
}
// This field can't be null
public bool Nullable
{
get { return false; }
}
// This is not the Primary Key
public bool PrimaryKey
{
get { return false; }
}
// These properties do not apply
public int Precision
{
get { return -1; }
}
public int Scale
{
get { return -1; }
}
}
}
开发者ID:.NET开发者,项目名称:System.Web.UI.Design,代码行数:396,代码来源:DataSourceDesigner
注:本文中的System.Web.UI.Design.DataSourceDesigner类示例整理自Github/MSDocs等源码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。 |
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