Read and write application settings c#

You can then access those settings from code using the Properties.

Read and write application settings c#

But applications built with the. NET framework using Visual Studio can take advantage of built-in tools to simplify or speed up access and saving of runtime values. Once common example is saving database connection string information in a configuration file so that it may be changed without need to recompile the application.

Here are some simple examples in VB. C code uses a slightly different syntax the concepts are similar. The following examples are using Visual Studio and VB.

You also define a data type such as string, integer, date, even special types such as connection string. Only two possible scopes are available: Application — is read-only at runtime; you can edit a value and have the app use without recompiling.

read and write application settings c#

If you need the application so save the value at runtime such as a user preference, then choose User as your scope, otherwise you would choose Application as the scope. Define Your Values in Visual Studio Go to your project properties, then click the settings tab on the left.

There you can define one or more values to be used by your application. For each value you will choose the data type, scope and a default value.

These values will be saved in a file named app. NET code, you can access values defined above using syntax like this.

FromName If the value is defined with a scope of User, then you can save the value back to an XML file for later retrieval. Below, the code checks for a value in a textbox an then assigns the value to the Settings object which will be later saved. The project level attribute mentioned above is typically already set in a new project.

In VSgo back to your project properties and click the tab la bled Application.

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There you will see the checkbox that controls this setting see image. When this value is checked, any User scoped values you have set back to the Settings object will be automatically saved.

You might think these value are saved back to the app. For example, my file was created at the following location: If different users login and use your application, each user can maintain their own separate and unique values making them perfect for user specific preferences.

Another example of the path is this… C: Note that the Assembly Version is the last folder in the path. This means that when you change the assembly version of your application, your User scoped values will be saved in a completely new user.

This is actually clever and ensures that each version of your application does not clash or overwrite values from a previous version. So what happens to the values in the previous app.

They are really just default values that your application can access at runtime if needed. Any User scoped values will be read from the user. Synchronize Often If you been able get this far without falling asleep, you have probably pondered the concept that with so many files holding the same data that things could get out of sync.

Or perhaps you are one of the many developers who gave up on using the app. Well the reason is because they do get out of sync. And to remedy that problem, Microsoft provided a Synchronize button in the Visual Studio Settings pane as well as programmatic controls.

This button will sync the config files and delete and create new user. The tip here is use the Synchronize button anytime you change the values in the Visual Studio Settings pane.Reading and writing files. In this chapter, we will look into reading and writing simple files with C#.

Fortunately for us, C# makes it very  · The values are loaded only once during Initialize() (or Read() if you decide to re-read settings manually) and are cached in the properties after the initial load. The values of the properties reflect the values of the configuration store - here from the application's config or file, in a MyConfiguration These methods either read or write all of the settings declared by the class using the reader/writer object passed as an argument.

read and write application settings c#

After that, the form declares an instance of MySettings and calls it /a-custom-settings-class-for-winforms. How To: Write User Settings at Run Time with C#.

03/30/; 2 minutes to read Contributors. all; In this article. Settings that are application-scoped are read-only, and can only be changed at design time or by altering file in between application sessions. I'm working on a C# class library that needs to be able to read settings from the or file (depending on whether the DLL is referenced from an web application or a Windows Forms application).

· When and how to apply application settings Ask Question. At application startup, I read the ashio-midori.comt object and put all the relevant values in my own configuration object, (at application exit, when the user changes settings, etc.), I write into the ashio-midori.comt object the configuration values from my configuration

Writing the Read Only Application-scoped Settings - CodeProject