Komponenten mit Visual Basic .NET programmieren

John Alexander is a Microsoft Certified Trainer (MCT) and Microsoft Certified Solution Developer (MCSD), as well as a Microsoft Regional Director. He currently works as a marketing technologist at G.A. Sullivan.

Inhaltsverzeichen (der englischen Originalausgabe)

Table of Contents

 Acknowledgments xv 

 Introduction xvii 

1 Introduction to Object-Oriented Development 1 

 The .NET Framework 2 

 Visual Studio .NET Support for Components 6 

 General Language Changes in Visual Basic .NET 8 

 Data Type Changes 8 

 Arrays 9 

 String Handling 10 

 Structured Exception Handling 12 

 Components, Classes, and Objects 13 

 Components and Classes 14 

 Class and Module Files 16 

 Instantiating and Using Classes 17 

 Structures 19 

 Property Procedures 20 

 Working with Methods 21 

 Overloading Properties and Methods 22 

 Overriding Existing Methods 23 

 Events 24 

 Interfaces and Implements 25 

 Shared Members 26 

 Namespaces 26 

 Inheritance 28 

 Deploying .NET Applications 29 

2 Architectural Options with .NET 33 

 Choosing the Right Architecture 34 

 Brief History of Software Architecture 35 

 One-Tier Architecture 35 

 Two-Tier Architecture 36 

 Three-Tier Architecture 39 

 Flexible n-Tier Architecture 43 

 Solutions Using the .NET Framework 50 

 User Interfaces 51 

 Facade Functions 53 

 Business Layer 53 

 Data Access Layer 54 

 Data Layer 54 

 Analysis and Design 54 

3 Exception Handling in the .NET Framework 59 

 The Exceptional News on .NET 60 

 What Is Structured Exception Handling? 61 

 Structured Exception Handling 62 

 Object-Oriented Exception Handling 62 

 The Syntax of the Try Statement 63 

 Defining Exception-Handling Objects 66 

 Guidelines for Defining Custom Exception Classes 66 

 Defining a Custom Base Class for Exceptions 68 

 Event Logging 75 

 Exception-Handling Objects and Remoting 78 

 Creating an Application Exception Class Hierarchy 80 

4 Implementing the Data Access Layer 83 

 The Power of ADO.NET 84 

 Performance 84 

 Scalability 84 

 XML Equals Interoperability 85 

 Ease of Use 85 

 Components of ADO.NET 85 

 Connection Object 87 

 Command Object 88 

 DataReader Object 91 

 DataSet Object 93 

 The ADO.NET Data Access Object 95 

 Why Have a Data Access Object? 95 

 What Will the Data Access Object Do? 96 

 Our Approach to Database Access and Usage 97 

 Implementing the Data Access Object 97 

 The Data Access Object as a Component 97 

 Private Variables and Objects 100 

 Constructors 100 

 Properties 101 

 The First Method: Running an SQL Statement and Returning a DataSet 102 

 Exception Handling 103 

 Logging Exceptions 103 

 What Else? 104 

 The Complete Code for the runSQLDataSet Method 107 

 Using the Data Access Object 118 

 Additional Questions About Data Access 119 

 How Do We Handle Transactions? 119 

 What About Data Concurrency? 119 

 What About Connection Pooling? 119 

 Can We Use Performance Counters? 120 

5 Implementing the Security Layer 121 

 Overview of Relevant .NET Security Features 122 

 Application Security Needs 123 

 Forms Authentication Services 124 

 Creating the Forms Authentication Architecture for an Application 125 

 Configuring the Application 126 

 Creating the Credentials Store 128 

 Creating the Login Form 129 

 Authorization Features 134 

 Authorization Types in the .NET Framework 135 

 Working with Role-Based Authorization 135 

 URL Authorization 138 

 The Security Layer 138 

 Creating the SecurIt Component 140 

 Creating the Secure ASP.NET Header 148 

 Using the SecurIt Layer 153 

6 Implementing Generic Web Client Handlers 157 

 User Interface Options with ASP.NET 158 

 The Past 158 

 The Present 159 

 The Future 161 

 Choosing Between User Controls and Custom Server Controls 161 

 Building User Controls 163 

 The Basics of User Controls 164 

 Properties of User Controls 167 

 Methods of User Controls 171 

 Event Bubbling in User Controls 173 

 Dynamically Loaded User Controls 175 

 Building Custom Server Controls 178 

 The Basics of Full Custom Server Controls 179 

 Enhanced or Derived Custom Server Controls 185 

 Enhanced ASP.NET DropDownList Server Control 185 

 Highlighting the Selected Textbox Server Control 188 

 Composite Server Controls 192 

 Composite ASP.NET MyLabelTextBox Server Controls 193 

 Enhanced Composite ASP.NET MyLabelTextBox Server Controls 201 

 Events and Custom Server Controls 205 

 Using Windows Forms Controls 206 

7 Implementing the Menu Handlers 211 

 A Bit of Menu Strategy 212 

 Our Approach to Designing Effective Menus 214 

 Creating Menu and Navigation Bar Objects 218 

 .NET Technology Used 218 

 Designing the Control 223 

 The MenuData Component 224 

 The Main Menu Custom User Control 229 

 The Navigation Bar Custom User Control 231 

 Other Options for User Controls 236 

 A Visual Basic .NET Windows Forms Example 238 

8 Implementing the Business Layer 243 

 Why Do We Need a Business Layer? 243 

 Designing Generic Business Objects 244 

 Determining Business Rules 246 

 Interacting with the Security Layer 247 

 Interacting with the Data Access Layer 248 

 Building and Determining Queries Based on Business Rules 248 

 Get-Related Stored Procedures 255 

 Insert-Related Stored Procedures 257 

 Update-Related Stored Procedures 259 

 Object-Oriented Features of Visual Basic .NET 261 

 Constructors Revisited 261 

 Overloading 263 

 Overloaded Constructors 264 

 Inheritance in HRnet 265 

9 Implementing Facade Layers 271 

 Advantages of Facade Layers and Applications 272 

 Designing the Facade Layers 273 

 Building the Facade Objects 275 

 The EmployeeHRObject Facade Class 281 

 EmployeeCSObject Facade Class 283 

10 Creating the User Interface Template 287 

 HRnet Sample Application Specifications 288 

 HRnet Application Architecture 288 

 HRnet Application Functionality 289 

 Creating the HRnet Web Template 294 

 The Web Template Layout 294 

 The Web Template Files 295 

 Starting the HRnet Application 299 

 The HRnet Home Page 301 

 Web Page Templates: The Other Option 304 

 Additional Functionality 310 

 Creating the HRnet Windows Forms Template 311 

 The Base Forms 312 

 The Final Data Entry Form 315 

 Calling Code from Web Pages and Windows Forms 315 

11 Building Information Pages 317 

 A Bit of User Interface Strategy 318 

 Web-Based vs. Windows-Based Data Presentation Forms 320 

 Data Presentation Forms 321 

 ASP.NET DataGrid Control for List Forms 321 

 Customizing the Default ASP.NET DataGrid Control 325 

 Adding Functionality to a Custom DataGrid Control 328 

 Adding Better Graphics 332 

 Changing the Footer 333 

 Adding the GoTo Function 337 

 Adding Sorting Capabilities 342 

 Adding Final Enhancements 346 

 Showing Detail Information 350 

 A One-Page Grid and Detail Form 351 

 Grid and Detail Forms Separated 356 

 Enhancing the Page Grid and Detail Form 359 

 State Handling in the Detail Custom Server Control 363 

 Scalability and Performance 367 

12 Implementing the Business Layer: XML Web Services 373 

 Implementing XML Web Services 374 

 Consuming XML Web Services 376 

 Under the Proxy’s Hood 378 

 Using Publicly Available Services 378 

 The WeatherInfo Web Control 383 

 SOAP: Your XML Web Service’s New Best Friend 385 

 Currently Supported Protocols 385 

 SOAP Document Structure 386 

 Calling from the Client 389 

13 Using Remoting for Communication 391 

 Starting Out 391 

 Creating the Server 393 

 Building Your First Remoting Client 395 

 Building the Remote Host 400 

 Windows Hoster 400 

 Windows Service Hoster 401 

 Remoting the Business Objects 405 

 Security Layer 406 

 Business Layer 407 

 Remoting Deployment 409 

 Creating the Client 410 

14 Wiring the Application Together 417 

 Steps for Wiring the Application 418 

 Step 1: Menu Structure and Templates 419 

 Step 2: Security 421 

 Step 3: The Home Page 429 

 Step 4: Information and Data Pages 437 

 An HRnet Windows Form: Titles 454 

 Titles: DataGrid and Detail in One Windows Form 454 

 Deploying an Application 459 

 Deploy with XCOPY 460 

 Deploy Global Files 460 

 Deploy by Creating a Windows Installer Package 463 

 Assemblies and Versioning 465 

INDEX 469