How to: Build and Run the Profile Provider Example

Artículo
10/15/2014

The topics in this section include the code for an ASP.NET profile provider example. The example provider uses the .NET Framework data provider for ODBC to connect to an ODBC data source. The example uses an Access database as its data source.

This topic describes implementation details about the profile provider example and describes how to build the example and configure an ASP.NET application to use the example provider.

Note
Because data sources support differing SQL syntax, some SQL commands will work with one data source and not with another. As a result, we recommend that you create a profile provider specific to your data source even if you are using the .NET Framework Data Provider for ODBC or the .NET Framework Data Provider for OLEDB to access your data source. For example, you might create separate providers such as SybaseProfileProvider, OracleProfileProvider, and so on.

Because data sources support differing SQL syntax, some SQL commands will work with one data source and not with another. As a result, we recommend that you create a profile provider specific to your data source even if you are using the .NET Framework Data Provider for ODBC or the .NET Framework Data Provider for OLEDB to access your data source. For example, you might create separate providers such as SybaseProfileProvider, OracleProfileProvider, and so on.

To view the code for the example provider, see Profile Provider Implementation Example.

Creating the Provider Database

The provider is designed to read and write data in three database tables: Profiles, StockSymbols, and ProfileData. The example profile provider supports two profile properties: a list of stock symbols and a ZIP (postal) code.

Each user profile is uniquely identified in the Profiles table of the database. Profile information such as the application name and last activity date is contained in this table. The Profiles table includes an automatically incremented primary key that is used to uniquely identify each row and relate the table to other tables in the database that contain profile property values.

The StockSymbols table contains the values for the list of stock symbols stored and retrieved using the StockSymbols property. The StockSymbols table has a one-to-many relationship with the Profiles table, because a single user profile can track any number of stock symbols.

The ZipCode property value is stored in the ProfileData table. The ProfileData table has a one-to-one relationship with the Profiles table.

To create the database tables for storing profiles

Create a new Microsoft Access database or open an existing one.

Note
If you store your database in the file folders of your Web application, we recommend that you store the database in the application's App_Data folder. The contents of the App_Data are available to your application code, but are not exposed to Web requests. In addition, the ASP.NET process has permissions to read and write in the App_Data folder.

In Access or another tool that can create tables in an Access database, issue the following data-definition query to create the Profiles table:

CREATE TABLE Profiles
(
  UniqueID AutoIncrement NOT NULL PRIMARY KEY,
  Username Text (255) NOT NULL,
  ApplicationName Text (255) NOT NULL,
  IsAnonymous YesNo, 
  LastActivityDate DateTime,
  LastUpdatedDate DateTime,
    CONSTRAINT PKProfiles UNIQUE (Username, ApplicationName)
)

Issue the following data-definition query to create the StockSymbols table:

CREATE TABLE StockSymbols
(
  UniqueID Integer,
  StockSymbol Text (10),
    CONSTRAINT FKProfiles1 FOREIGN KEY (UniqueID)
      REFERENCES Profiles
)

Issue the following data-definition query to create the ProfileData table:

CREATE TABLE ProfileData
(
  UniqueID Integer,
  ZipCode Text (10),
    CONSTRAINT FKProfiles2 FOREIGN KEY (UniqueID)
      REFERENCES Profiles
)

Providing Event Log Access

If the example provider encounters an exception when working with the data source, the provider writes the details of the exception to the Windows Application event log instead of returning the exception to the ASP.NET application. This is done as a security measure to keep private information about the data source from being exposed in the ASP.NET application.

The example provider specifies an event Source of "OdbcProfileProvider". Before your ASP.NET application will be able to write to the Application event log successfully, you will need to create access to the event log.

Note
If you do not want the example provider to write exceptions to the event log, you can set the `writeExceptionsToEventLog` attribute to false in the provider configuration in the Web.config file.

To provide access to the event log

Using Regedit.exe or another Windows registry editing tool, create the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\Application\OdbcProfileProvider

Building the Example Provider

In order to use the example provider, you must make the code available to your Web application. You can do so in two ways:

Put the example provider source code into the application's App_Code folder. In that case, you do not need to manually compile the example code.
Compile the code and put the resulting assembly into the application's Bin folder, or strongly name it and place it in the global assembly cache.

To test the example provider without manually compiling

If your application does not already have one, create a folder named App_Code under the application root.

In the App_Code folder, create a text file named OdbcProfileProvider.vb or OdbcProfileProvider.cs, depending on what programming language you want to use.

Note
If you already have source code in the App_Code directory of your application, use the version of the example provider written in the same language as the existing code in the directory. ASP.NET will compile the provider when a page from your ASP.NET application is first requested.

Copy and paste the example source code (in the appropriate language) into the corresponding text file and save the file.

To compile the example provider

Create a folder for the source files for custom controls and related classes.

In the source code folder, create a text file named OdbcProfileProvider.vb or OdbcProfileProvider.cs, depending on what programming language you want to use.

Note
Do not put the source code in the App_Code folder if you also intend to manually compile the example and add its assembly to the Bin folder. If you do, the provider's type will exist in both the compiled assembly and in the dynamically generated assembly created by ASP.NET from the App_Code folder. This will create an ambiguous reference when loading the provider and any code that references the type will generate a compiler error.

Do not put the source code in the App_Code folder if you also intend to manually compile the example and add its assembly to the Bin folder. If you do, the provider's type will exist in both the compiled assembly and in the dynamically generated assembly created by ASP.NET from the App_Code folder. This will create an ambiguous reference when loading the provider and any code that references the type will generate a compiler error.

Copy and paste the source code for each sample into the corresponding text file and save the file.

Run the following command from the source code folder to compile the controls and related classes into an assembly.

vbc /out:OdbcProfileProvider.dll /t:library OdbcProfileProvider.vb /r:System.Web.dll /r:System.Configuration.dll

csc /out:OdbcProfileProvider.dll /t:library OdbcProfileProvider.cs /r:System.Web.dll /r:System.Configuration.dll

The /t:library compiler option tells the compiler to create a library (rather than an executable assembly). The /out option provides a name for the assembly and the /r option lists the assemblies that are linked to your assembly.

Note
If you cannot execute the compiler command, you must add the .NET Framework installation path to the PATH variable before running the command. In Windows, right-click My Computer, click Properties, click the Advanced tab, and then click the Environment Variables button. In the System variables list, double-click the Path variable. In the Variable value text box, add a semicolon (;) to the end of the existing values in the text box, and then type the path of your .NET Framework installation. The .NET Framework is usually installed in the Windows installation folder at \Microsoft.NET\Framework\versionNumber.

If you cannot execute the compiler command, you must add the .NET Framework installation path to the PATH variable before running the command. In Windows, right-click My Computer, click Properties, click the Advanced tab, and then click the Environment Variables button. In the System variables list, double-click the Path variable. In the Variable value text box, add a semicolon (;) to the end of the existing values in the text box, and then type the path of your .NET Framework installation. The .NET Framework is usually installed in the Windows installation folder at \Microsoft.NET\Framework\versionNumber.

Configuring the Example Provider in an ASP.NET Application

To use the example provider with an ASP.NET Web application, you must configure the application to register the provider.

The example configuration assumes that your Web site is set up to use forms authentication and includes an ASP.NET page called Login.aspx that allows users to log in and establish a user identity. The example configuration also supports anonymous authentication, so users are not required to log in.

To configure an application to use the example provider

Create an ASP.NET page named Login.aspx and do one of the following:
- Add a Login control to it, if the application is already configured to use ASP.NET membership.
- Create a login form and use forms authentication to authenticate users. For details, see How to: Implement Simple Forms Authentication.
  
  Note
  
  The configuration element required for forms authentication is illustrated in Step 4.
Create a DSN named "OdbcProfile" on your computer and configure it to include connection information to the Access database you created earlier.
If your ASP.NET application does not already have one, create a text file named Web.config in the application's root folder.

Note
The configuration element required for forms authentication is illustrated in Step 4.

In the Web.config file, add the following elements:

<configuration>
  <connectionStrings>
    <add name="OdbcProfile" connectionString="DSN=OdbcProfile;" />
  </connectionStrings>

  <system.web>
    <authentication mode="Forms" >
      <forms loginUrl="login.aspx"
        name=".ASPXFORMSAUTH" />
    </authentication>

    <anonymousIdentification enabled="true" />

    <profile defaultProvider="OdbcProvider">
      <providers>
        <add
          name="OdbcProvider"
          type="Samples.AspNet.Profile.OdbcProfileProvider" 
          connectionStringName="OdbcProfile" /> 
      </providers>

      <properties>
        <add name="ZipCode" 
          allowAnonymous="true" />
        <add name="CityAndState" 
          provider="AspNetSqlProfileProvider" 
          allowAnonymous="true" />
        <add name="StockSymbols" 
          type="System.Collections.ArrayList" 
          allowAnonymous="true" />
      </properties>
    </profile>
  </system.web>
</configuration>

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