ServiceContainer 類別

定義

命名空間:

System.ComponentModel.Design

組件:

System.ComponentModel.TypeConverter.dll

來源:

ServiceContainer.cs

提供 IServiceContainer 介面的簡單實作。 無法繼承這個類別。

C#

public class ServiceContainer : IDisposable, IServiceProvider, System.ComponentModel.Design.IServiceContainer

繼承

Object

ServiceContainer

實作

IServiceContainer IDisposable IServiceProvider

範例

下列範例程式示範服務鏈結和連結 ServiceContainer 對象鏈結的結果服務可用性。 此程式提供使用者介面，可讓您查看連結服務鏈結內服務的可用性，並使用 AddService、GetService和 RemoveService 方法，以及鏈接的服務容器。

C#

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;

namespace ServiceArchitectureExample
{
    // Example form provides UI for demonstrating service sharing behavior 
    // of a network of IServiceContainer/IServiceProvider controls.
    public class ServiceForm : System.Windows.Forms.Form
    {                
        // Root service container control for tree.
        private ServiceObjectControl root;         
             
        // Button for clearing any provided services and resetting tree states.
        private System.Windows.Forms.Button reset_button;       

        // Color list used to color code controls.
        private Color[] colorkeys;                              

        // Strings used to reflect text service.
        private string[] keystrings;                            

        public ServiceForm()
        {
            InitializeComponent();
            CreateServiceControlTree();
            colorkeys = new Color[] { Color.Beige, Color.SeaShell, Color.LightGreen, Color.LightBlue, Color.Khaki, Color.CadetBlue };
            keystrings = new string[] { "No service use", "Service not accessible", "Service provided", "Service obtained", "Service accessible", "No further access" };
        }

        private void CreateServiceControlTree()
        {
            // Create root service control.
            ServiceObjectControl control1 = new ServiceObjectControl(null, new Size(300, 40), new Point(10, 80), this);
            root = control1;
            // Create first tier - pass parent with service object control 1
            ServiceObjectControl control2 = new ServiceObjectControl(control1, new Size(200, 30), new Point(50, 160), this);
            ServiceObjectControl control3 = new ServiceObjectControl(control1, new Size(200, 30), new Point(50, 240), this);
            // Create second tier A - pass parent with service object control 2
            ServiceObjectControl control4 = new ServiceObjectControl(control2, new Size(180, 20), new Point(300, 145), this);
            ServiceObjectControl control5 = new ServiceObjectControl(control2, new Size(180, 20), new Point(300, 185), this);
            // Create second tier B - pass parent with service object control 3
            ServiceObjectControl control6 = new ServiceObjectControl(control3, new Size(180, 20), new Point(300, 225), this);
            ServiceObjectControl control7 = new ServiceObjectControl(control3, new Size(180, 20), new Point(300, 265), this);
            // Add controls.
            this.Controls.AddRange( new Control[] { control1, control2, control3, control4, control5, control6, control7 } );
        }

        internal void ResetServiceTree(object sender, EventArgs e)
        {
            // Remove the service from the service tree.
            if( root.serviceContainer.GetService(typeof(TextService)) != null )            
                root.serviceContainer.RemoveService(typeof(TextService), true);

            // Set all controls to "not obtained" and clear their labels.
            for( int i=0; i<Controls.Count; i++ )
                if( !Controls[i].Equals(reset_button) ) 
                {
                    ((ServiceObjectControl)Controls[i]).state = TextServiceState.ServiceNotObtained;
                    ((ServiceObjectControl)Controls[i]).label = string.Empty;
                    ((ServiceObjectControl)Controls[i]).BackColor = Color.Beige;
                }
        }

        public void UpdateServiceCoverage()
        {
            // Have each control set state to reflect service availability.
            for( int i=0; i<Controls.Count; i++ )
                if( !Controls[i].Equals(reset_button) )                 
                    ((ServiceObjectControl)Controls[i]).ReflectServiceVisibility();                                 
        }

        #region Windows Form Designer generated code
        private void InitializeComponent()
        {
            this.reset_button = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // reset_button
            // 
            this.reset_button.Location = new System.Drawing.Point(392, 88);
            this.reset_button.Name = "reset_button";
            this.reset_button.TabIndex = 0;
            this.reset_button.TabStop = false;
            this.reset_button.Text = "Reset";
            this.reset_button.Click += new System.EventHandler(this.ResetServiceTree);
            // 
            // ServiceForm
            // 
            this.ClientSize = new System.Drawing.Size(512, 373);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.reset_button});
            this.MinimumSize = new System.Drawing.Size(520, 400);
            this.Name = "ServiceForm";
            this.Text = "Service Container Architecture Example";
            this.ResumeLayout(false);
        }
        #endregion

        [STAThread]
        static void Main() 
        {
            Application.Run(new ServiceForm());
        }

        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
        {            
            e.Graphics.DrawString("The following tree diagram represents a hierarchy of linked service containers in controls.", new Font("Arial", 9), new SolidBrush(Color.Black), 4, 4);
            e.Graphics.DrawString("This example demonstrates the propagation behavior of services through a linked service object tree.", new Font("Arial", 8), new SolidBrush(Color.Black), 4, 26);            
            e.Graphics.DrawString("Right-click a component to add or replace a text service, or to remove it if the component provided it.", new Font("Arial", 8), new SolidBrush(Color.Black), 4, 38);
            e.Graphics.DrawString("Left-click a component to update text from the text service if available.", new Font("Arial", 8), new SolidBrush(Color.Black), 4, 50);

            // Draw lines to represent tree branches.
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black), 1), 20, 125, 20, 258);
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black), 1), 21, 175, 45, 175);
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black), 1), 21, 258, 45, 258);
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black), 1), 255, 175, 285, 175);
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black), 1), 255, 258, 285, 258);
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black), 1), 285, 155, 285, 195);
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black), 1), 285, 238, 285, 278);            
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black), 1), 285, 155, 290, 155);
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black), 1), 285, 195, 290, 195);
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black), 1), 285, 238, 290, 238);
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black), 1), 285, 278, 290, 278);

            // Draw color key.
            e.Graphics.DrawRectangle(new Pen(new SolidBrush(Color.Black), 1), 20, 305, 410, 60);
            int y=0;
            for( int i=0; i<3; i++ )
            {
                e.Graphics.FillRectangle(new SolidBrush(colorkeys[y]), 25+(i*140), 310, 20, 20);           
                e.Graphics.DrawRectangle(new Pen(new SolidBrush(Color.Black), 1), 25+(i*140), 310, 20, 20);     
                e.Graphics.DrawString(keystrings[y], new Font("Arial", 8), new SolidBrush(Color.Black), 50+(i*140), 315);
                y++;
                e.Graphics.FillRectangle(new SolidBrush(colorkeys[y]), 25+(i*140), 340, 20, 20);           
                e.Graphics.DrawRectangle(new Pen(new SolidBrush(Color.Black), 1), 25+(i*140), 340, 20, 20);              
                e.Graphics.DrawString(keystrings[y], new Font("Arial", 8), new SolidBrush(Color.Black), 50+(i*140), 345);
                y++;
            }
        }
    }

    // An example user control that uses ServiceContainer to add, remove,
    // and access services through a linkable service container network.
    public class ServiceObjectControl : System.Windows.Forms.UserControl
    {
        // This example user control implementation provides a wrapper for 
        // ServiceContainer, supporting a linked service container network.    
        public ServiceContainer serviceContainer;        
        // Parent form reference for main program function access.
        private ServiceForm parent;                  
        // String for label displayed on the control to indicate the 
        // control's current service-related configuration state.
        public string label;               
        // The current state of the control reflecting whether it has 
        // obtained or provided a text service.
        private TextServiceState state_;
        public TextServiceState state
        {
            get
            {
                return state_;
            }
            set
            {
                if( (TextServiceState)value == TextServiceState.ServiceProvided )
                    this.BackColor = Color.LightGreen;
                else if( (TextServiceState)value == TextServiceState.ServiceNotObtained )                
                    this.BackColor = Color.White;                                   
                else if( (TextServiceState)value == TextServiceState.ServiceObtained )
                    this.BackColor = Color.LightBlue;
                else if( (TextServiceState)value == TextServiceState.ServiceNotFound )                                    
                    this.BackColor = Color.SeaShell;                
                state_ = value;
            }
        }        
        
        public ServiceObjectControl(ServiceObjectControl serviceContainerParent, Size size, Point location, ServiceForm parent)
        {
            this.state_ = TextServiceState.ServiceNotObtained;
            this.BackColor = Color.Beige;            
            this.label = string.Empty;            
            this.Size = size;
            this.Location = location;
            this.parent = parent;            
            if( serviceContainerParent == null )
                serviceContainer = new ServiceContainer();
            else
                serviceContainer = new ServiceContainer(serviceContainerParent.serviceContainer);
        }

        // Paint method override draws the label string on the control.
        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
        {
            e.Graphics.DrawString(label, new Font("Arial", 8), new SolidBrush(Color.Black), 5, 5);            
        }

        // Process mouse-down behavior for click.
        protected override void OnMouseDown(System.Windows.Forms.MouseEventArgs e)
        {
            if( e.Button == MouseButtons.Left )
            {
                if( state_ != TextServiceState.ServiceProvided )
                {
                    // Attempt to update text from service, and set color 
                    // state accordingly.
                    TextService ts = (TextService)serviceContainer.GetService(typeof(TextService));
                    if( ts != null )
                    {
                        this.label = ts.text;
                        state = TextServiceState.ServiceObtained;
                    }
                    else
                    {                    
                        this.label = "Service Not Found";                        
                        state = TextServiceState.ServiceNotFound;
                    }
                }
            }
            if( e.Button == MouseButtons.Right )
            {
                if( state_ == TextServiceState.ServiceProvided )
                {
                    // Remove service if the container provided it.
                    if( serviceContainer.GetService(typeof(TextService)) != null )
                    {
                        serviceContainer.RemoveService(typeof(TextService), true);
                        state = TextServiceState.ServiceNotObtained; 
                        this.label = "Service Removed";                                                                   
                    }                    
                }
                else
                {
                    // Obtain string and provide text service.
                    using (StringInputDialog form = new StringInputDialog("Test String"))
                    {
                        form.StartPosition = FormStartPosition.CenterParent;
                        if (form.ShowDialog() == DialogResult.OK)
                        {
                            if (serviceContainer.GetService(typeof(TextService)) != null)
                                serviceContainer.RemoveService(typeof(TextService), true);
                            parent.ResetServiceTree(this, new EventArgs());
                            serviceContainer.AddService(typeof(TextService), new TextService(form.inputTextBox.Text), true);
                            state = TextServiceState.ServiceProvided;
                            this.label = "Provided Text: " + form.inputTextBox.Text;
                        }
                    }
                }
            }
            parent.UpdateServiceCoverage();
        }

        // Method accesses the TextService to test the visibility of the service 
        // from the control, and sets the UI state accordingly.
        public void ReflectServiceVisibility()
        {
            if( state_ == TextServiceState.ServiceObtained )
            {
                if( serviceContainer.GetService(typeof(TextService)) == null )  
                    this.BackColor = Color.CadetBlue;
            }
            else if( state_ != TextServiceState.ServiceProvided )
            {
                if( serviceContainer.GetService(typeof(TextService)) == null )
                {
                    this.BackColor = Color.White;
                    return;
                }

                // Service available.                  
                if( state_ == TextServiceState.ServiceNotFound )                
                    this.BackColor = Color.Khaki;                
                else if( state_ == TextServiceState.ServiceNotObtained && label != "Service Removed" )
                    this.BackColor = Color.Khaki;       
            }            
        }
    }

    // Example service type contains a text string, sufficient 
    // to demonstrate service sharing.
    public class TextService
    {
        public string text;

        public TextService() : this(string.Empty)
        {
        }

        public TextService(string text)
        {
            this.text = text;
        }
    }

    public enum TextServiceState
    {
        ServiceNotObtained,
        ServiceObtained,
        ServiceProvided,
        ServiceNotFound
    }

    // Example Form for entering a string.
    internal class StringInputDialog : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Button ok_button;
        private System.Windows.Forms.Button cancel_button;
        public System.Windows.Forms.TextBox inputTextBox;

        public StringInputDialog(string text)
        {
            InitializeComponent();
            inputTextBox.Text = text;
        }

        private void InitializeComponent()
        {
            this.ok_button = new System.Windows.Forms.Button();
            this.cancel_button = new System.Windows.Forms.Button();
            this.inputTextBox = new System.Windows.Forms.TextBox();
            this.SuspendLayout();
            this.ok_button.Anchor = (System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right);
            this.ok_button.Location = new System.Drawing.Point(180, 43);
            this.ok_button.Name = "ok_button";
            this.ok_button.TabIndex = 1;
            this.ok_button.Text = "OK";      
            this.ok_button.DialogResult = System.Windows.Forms.DialogResult.OK;            
            this.cancel_button.Anchor = (System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right);
            this.cancel_button.Location = new System.Drawing.Point(260, 43);
            this.cancel_button.Name = "cancel_button";
            this.cancel_button.TabIndex = 2;
            this.cancel_button.Text = "Cancel";            
            this.cancel_button.DialogResult = System.Windows.Forms.DialogResult.Cancel;
            this.inputTextBox.Location = new System.Drawing.Point(6, 9);
            this.inputTextBox.Name = "inputTextBox";
            this.inputTextBox.Size = new System.Drawing.Size(327, 20);
            this.inputTextBox.TabIndex = 0;
            this.inputTextBox.Text = "";            
            this.inputTextBox.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
                | System.Windows.Forms.AnchorStyles.Right);
            this.ClientSize = new System.Drawing.Size(342, 73);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.inputTextBox,
                                                                          this.cancel_button,
                                                                          this.ok_button});
            this.MinimumSize = new System.Drawing.Size(350, 100);
            this.Name = "StringInputDialog";
            this.Text = "Text Service Provide String Dialog";
            this.ResumeLayout(false);
        }		
    }
}

備註

ServiceContainer 物件可用來儲存和提供服務。 ServiceContainer 實作 IServiceContainer 介面。

您可以使用建構函式來建立 ServiceContainer 物件，這個建構函式會新增父 IServiceContainer，以便選擇性地從所有父系 IServiceContainer 物件加入或移除服務，包括直接父 IServiceContainer。 若要透過父系從連結至此 IServiceContainer 的所有 IServiceContainer 實作新增或移除服務，請呼叫接受布爾值，指出是否要升級服務要求的布爾值 AddService 或 RemoveService 方法多載。

注意

套用至此類別的 HostProtectionAttribute 屬性具有下列 Resources 屬性值：SharedState。 HostProtectionAttribute 不會影響傳統型應用程式（通常是透過按兩下圖示、輸入命令或在瀏覽器中輸入URL來啟動）。 如需詳細資訊，請參閱 HostProtectionAttribute 類別或 SQL Server 程式設計與主機保護屬性。

建構函式

ServiceContainer()	初始化 ServiceContainer 類別的新實例。
ServiceContainer(IServiceProvider)	使用指定的父服務提供者，初始化 ServiceContainer 類別的新實例。

屬性

DefaultServices

取得直接透過 ServiceContainer實作的預設服務。

方法

AddService(Type, Object, Boolean)	將指定的服務加入至服務容器。
AddService(Type, Object)	將指定的服務加入至服務容器。
AddService(Type, ServiceCreatorCallback, Boolean)	將指定的服務加入至服務容器。
AddService(Type, ServiceCreatorCallback)	將指定的服務加入至服務容器。
Dispose()	處置此服務容器。
Dispose(Boolean)	處置此服務容器。
Equals(Object)	判斷指定的物件是否等於目前的物件。 (繼承來源 Object)
GetHashCode()	做為預設哈希函式。 (繼承來源 Object)
GetService(Type)	取得要求的服務。
GetType()	取得目前實例的 Type。 (繼承來源 Object)
MemberwiseClone()	建立目前 Object的淺層複本。 (繼承來源 Object)
RemoveService(Type, Boolean)	從服務容器中移除指定的服務類型。
RemoveService(Type)	從服務容器中移除指定的服務類型。
ToString()	傳回表示目前 物件的字串。 (繼承來源 Object)

擴充方法

GetKeyedService<T>(IServiceProvider, Object)	從 IServiceProvider取得類型為 T 的服務。
GetKeyedServices(IServiceProvider, Type, Object)	從 IServiceProvider取得類型為 serviceType 的服務列舉。
GetKeyedServices<T>(IServiceProvider, Object)	從 IServiceProvider取得類型為 T 的服務列舉。
GetRequiredKeyedService(IServiceProvider, Type, Object)	從 IServiceProvider取得類型為 serviceType 的服務。
GetRequiredKeyedService<T>(IServiceProvider, Object)	從 IServiceProvider取得類型為 T 的服務。
CreateAsyncScope(IServiceProvider)	建立可用來解析範圍服務的新 AsyncServiceScope。
CreateScope(IServiceProvider)	建立可用來解析範圍服務的新 IServiceScope。
GetRequiredService(IServiceProvider, Type)	從 IServiceProvider取得類型為 serviceType 的服務。
GetRequiredService<T>(IServiceProvider)	從 IServiceProvider取得類型為 T 的服務。
GetService<T>(IServiceProvider)	從 IServiceProvider取得類型為 T 的服務。
GetServices(IServiceProvider, Type)	從 IServiceProvider取得類型為 serviceType 的服務列舉。
GetServices<T>(IServiceProvider)	從 IServiceProvider取得類型為 T 的服務列舉。
GetFakeLogCollector(IServiceProvider)	取得對象，這個物件會收集傳送至假記錄器之記錄檔記錄。
GetFakeRedactionCollector(IServiceProvider)	從相依性插入容器取得假的重構函式收集器實例。

適用於

另請參閱

• IServiceProvider
• IServiceContainer
• ServiceCreatorCallback