Asp.net load file path

UseHttpsRedirection ; app. UseStaticFiles ; app. UseAuthorization ; app. MapDefaultControllerRoute ; app. MapRazorPages ; app. Run ; Static files are accessible via a path relative to the web root.

Run ; The parameterless UseStaticFiles method overload marks the files in web root as servable. Serve files outside of web root Consider a directory hierarchy in which the static files to be served reside outside of the web root : wwwroot css images js MyStaticFiles images red-rose.

Combine builder. ToString ; app. Run ; The preceding code makes static files publicly available in the local cache for one week seconds : Static file authorization The ASP. When the Static File Middleware is called before the authorization middleware: No authorization checks are performed on the static files. Static files served by the Static File Middleware, such as those under wwwroot , are publicly accessible. To serve static files based on authorization: Store them outside of wwwroot.

Set the fallback authorization policy. Authorization; using Microsoft. Identity; using Microsoft. EntityFrameworkCore; using Microsoft. FileProviders; using StaticFileAuth. GetConnectionString "DefaultConnection" ; builder.

UseSqlServer connectionString ; builder. Build ; if app. UseRouting ; app. UseAuthentication ; app. Run ; In the preceding code, the fallback authorization policy requires all users to be authenticated. An alternative approach to serve files based on authorization is to: Store them outside of wwwroot and any directory accessible to the Static File Middleware.

StaticFiles; using Microsoft. AddControllersWithViews ; builder. Serve default documents Setting a default page provides visitors a starting point on a site. UseDefaultFiles ; app. With UseDefaultFiles , requests to a folder in wwwroot search for: default. The following code changes the default file name to mydefault.

Clear ; options. Add "mydefault. SaveAs Server. Redirect Request. AbsoluteUri ;. End Sub. Inside the Page Load event, the list of all files in the Uploads folder is fetched into a String Array using the GetFiles method of the Directory class.

Later, the values of the Array are copied to a Generic List collection consisting objects of ListItem class and then it is used to populate the GridView control. GetFiles Server. Add new ListItem Path. GetFileName filePath , filePath ;. DataBind ;. Add New ListItem Path.

GetFileName filePath , filePath. End If. Downloading the Uploaded File. GetFileName filePath ;. On your development computer this is not typically an issue. However, when you publish your site to a hosting provider's web server, you might need to explicitly set those permissions. If you run this code on a hosting provider's server and get errors, check with the hosting provider to find out how to set those permissions.

In the previous example, you used WriteAllText to create a text file that's got just one piece of data in it. If you call the method again and pass it the same file name, the existing file is completely overwritten. However, after you've created a file you often want to add new data to the end of the file.

You can do that using the AppendAllText method of the File object. In the website, make a copy of the UserData. This code has one change in it from the previous example.

The methods are similar, except that AppendAllText adds the data to the end of the file. Even if you don't need to write data to a text file, you'll probably sometimes need to read data from one. To do this, you can again use the File object. You can use the File object to read each line individually separated by line breaks or to read individual item no matter how they're separated. This procedure shows you how to read and display the data that you created in the previous example.

The code starts by reading the file that you created in the previous example into a variable named userData , using this method call:. The code to do this is inside an if statement. When you want to read a file, it's a good idea to use the File. Exists method to determine first whether the file is available. The code also checks whether the file is empty. The body of the page contains two foreach loops, one nested inside the other.

The outer foreach loop gets one line at a time from the data file. In this case, the lines are defined by line breaks in the file — that is, each data item is on its own line. The inner loop splits each data line into items fields using a comma as a delimiter. Based on the previous example, this means that each line contains three fields — the first name, last name, and email address, each separated by a comma. The code illustrates how to use two data types, an array and the char data type.

The array is required because the File. ReadAllLines method returns data as an array. The char data type is required because the Split method returns an array in which each element is of the type char. For information about arrays, see Introduction to ASP. You can use Microsoft Excel to save the data contained in a spreadsheet as a comma-delimited file.

When you do, the file is saved in plain text, not in Excel format. Each row in the spreadsheet is separated by a line break in the text file, and each data item is separated by a comma.

You can use the code shown in the previous example to read an Excel comma-delimited file just by changing the name of the data file in your code. To delete files from your website, you can use the File. Delete method. In production, appsettings.

For example, when deploying the app to Azure. Bind hierarchical configuration data using the options pattern The preferred way to read related configuration values is using the options pattern. All public read-write properties of the type are bound. Fields are not bound. In the preceding code, Position is not bound.

The Position property is used so the string "Position" doesn't need to be hard coded in the app when binding the class to a configuration provider. The following code: Calls ConfigurationBinder. Bind to bind the PositionOptions class to the Position section. Displays the Position configuration data.

GetSection PositionOptions. In the following code, PositionOptions is added to the service container with Configure and bound to configuration: using ConfigSample.

CreateBuilder args ; builder. AddRazorPages ; builder. Combining service collection Consider the following which registers services and configures options: using ConfigSample. Options; using Microsoft. Position ; builder. GetSection ColorOptions. Color ; builder. Build ; Related groups of registrations can be moved to an extension method to register services.

For example, the configuration services are added to the following class: using ConfigSample. Configuration; namespace Microsoft. Position ; services. The following code uses the new extension methods to register the services: using Microsoft. AddConfig builder. AddMyDependencyGroup ; builder. Build ; Note: Each services. DependencyInjection namespace: Encapsulates groups of service registrations.

Provides convenient IntelliSense access to the service. Security and user secrets Configuration data guidelines: Never store passwords or other sensitive data in configuration provider code or in plain text configuration files. The Secret Manager tool can be used to store secrets in development.

Don't use production secrets in development or test environments. Specify secrets outside of the project so that they can't be accidentally committed to a source code repository. For more information on storing passwords or other sensitive data: Use multiple environments in ASP. NET Core : Includes advice on using environment variables to store sensitive data. Environment variables Using the default configuration, the EnvironmentVariablesConfigurationProvider loads configuration from environment variable key-value pairs after reading appsettings.

Automatically replaced by a : The following set commands: Set the environment keys and values of the preceding example on Windows. Test the settings when using the sample download. The dotnet run command must be run in the project directory. Won't be read by browsers launched with Visual Studio. With the CLI: Start a new command window and enter dotnet run. Build ; In the preceding code: builder. This includes environment variables without the prefix.

The prefix is stripped off when the configuration key-value pairs are read. Azure App Service application settings are: Encrypted at rest and transmitted over an encrypted channel. Exposed as environment variables. Naming of environment variables Environment variable names reflect the structure of an appsettings. Escape environment variables on Linux On Linux, the value of URL environment variables must be escaped so systemd can parse it. WriteLine c.

App secrets in the Development environment. Environment variables. Switch mappings Switch mappings allow key name replacement logic. Switch mappings dictionary key rules: Switches must start with - or The switch mappings dictionary must not contain duplicate keys.

Set environment and command-line arguments with Visual Studio Environment and command-line arguments can be set in Visual Studio from the launch profiles dialog: In Solution Explorer, right click the project and select Properties. Hierarchical configuration data The Configuration API reads hierarchical configuration data by flattening the hierarchical data with the use of a delimiter in the configuration keys.

Configuration keys and values Configuration keys: Are case-insensitive. For example, ConnectionString and connectionstring are treated as equivalent keys. If a key and value is set in more than one configuration providers, the value from the last provider added is used. For more information, see Default configuration.

In environment variables, a colon separator may not work on all platforms. In Azure Key Vault, hierarchical keys use -- as a separator. The Azure Key Vault configuration provider automatically replaces -- with a : when the secrets are loaded into the app's configuration.

The ConfigurationBinder supports binding arrays to objects using array indices in configuration keys. Array binding is described in the Bind an array to a class section. Configuration values: Are strings. Null values can't be stored in configuration or bound to objects.

Configuration providers The following table shows the configuration providers available to ASP. A typical sequence of configuration providers is: appsettings.

Connection string prefixes The Configuration API has special processing rules for four connection string environment variables. SqlClient File configuration provider FileConfigurationProvider is the base class for loading configuration from the file system. HostingEnvironment; config. AddEnvironmentVariables ; if args! Build ; In the preceding code, settings in the MyIniConfig. Overloads can specify: Whether the file is optional. Whether the configuration is reloaded if the file changes.

Consider the following code: using Microsoft. AddJsonFile "MyConfig. Reads the default configuration providers before the MyConfig. Settings in the MyConfig. Whether the directory is optional and the path to the directory. Combine Directory. Clear ; config. AddInMemoryCollection Dict ; config.