Creating and Reading Cookies on Blazor Server Side in C#

Creating and Reading Cookies on Blazor Server Side in C#

In Blazor Server Side, you can use the built-in HttpContext class to create and read cookies. Here is an example of how to create and read cookies in Blazor Server Side:

Creating a Cookie

To create a cookie, you can use the HttpContext.Response.Cookies.Append method. Here's an example of how to create a cookie with a name of "myCookie" and a value of "Hello World":

@page "/" @inject IHttpContextAccessor HttpContextAccessor <button @onclick="CreateCookie">Create Cookie</button> @code { private void CreateCookie() { HttpContextAccessor.HttpContext.Response.Cookies.Append("myCookie", "Hello World"); } }

Reading a Cookie

To read a cookie, you can use the HttpContext.Request.Cookies property. Here's an example of how to read the "myCookie" cookie:

@page "/" @inject IHttpContextAccessor HttpContextAccessor <button @onclick="CreateCookie">Create Cookie</button> <button @onclick="ReadCookie">Read Cookie</button> <p>@cookieValue</p> @code { private string cookieValue = ""; private void CreateCookie() { HttpContextAccessor.HttpContext.Response.Cookies.Append("myCookie", "Hello World"); } private void ReadCookie() { cookieValue = HttpContextAccessor.HttpContext.Request.Cookies["myCookie"]; } }

Note that in order to access the HttpContext object, we are injecting the IHttpContextAccessor service using the @inject directive.

I hope this helps you create and read cookies in your Blazor Server Side application!

Examples

  1. How to create a cookie in Blazor Server Side in C#?

    // In a Razor component or code-behind protected override void OnInitialized() { var options = new CookieOptions { Expires = DateTime.Now.AddHours(1), // Set the expiration time IsEssential = true // Make the cookie essential }; HttpContext.Response.Cookies.Append("MyCookie", "CookieValue", options); }

    This code demonstrates creating a cookie named "MyCookie" with a value and specified options.

  2. How to read a cookie in Blazor Server Side in C#?

    // In a Razor component or code-behind protected override void OnInitialized() { var cookieValue = HttpContext.Request.Cookies["MyCookie"]; // Use cookieValue as needed }

    This code reads the value of a cookie named "MyCookie" from the incoming request.

  3. How to create a secure, HttpOnly cookie in Blazor Server Side in C#?

    // In a Razor component or code-behind protected override void OnInitialized() { var options = new CookieOptions { Expires = DateTime.Now.AddHours(1), HttpOnly = true, // Set HttpOnly to true for security Secure = true // Set Secure to true for HTTPS-only }; HttpContext.Response.Cookies.Append("SecureCookie", "SecureCookieValue", options); }

    This code creates a secure, HttpOnly cookie named "SecureCookie" with specific options.

  4. How to read all cookies in Blazor Server Side in C#?

    // In a Razor component or code-behind protected override void OnInitialized() { var allCookies = HttpContext.Request.Cookies; // Use allCookies dictionary as needed }

    This code retrieves all cookies from the incoming request.

  5. How to update the value of a cookie in Blazor Server Side in C#?

    // In a Razor component or code-behind protected override void OnInitialized() { var existingValue = HttpContext.Request.Cookies["MyCookie"]; if (existingValue != null) { var options = new CookieOptions { Expires = DateTime.Now.AddHours(1) }; HttpContext.Response.Cookies.Append("MyCookie", "NewValue", options); } }

    This code updates the value of a cookie named "MyCookie" with a new value.

  6. How to delete a cookie in Blazor Server Side in C#?

    // In a Razor component or code-behind protected override void OnInitialized() { HttpContext.Response.Cookies.Delete("MyCookie"); }

    This code deletes the cookie named "MyCookie" from the response.

  7. How to check if a cookie exists in Blazor Server Side in C#?

    // In a Razor component or code-behind protected override void OnInitialized() { var cookieExists = HttpContext.Request.Cookies.ContainsKey("MyCookie"); // Use cookieExists as needed }

    This code checks if a cookie named "MyCookie" exists in the incoming request.

  8. How to create a session cookie in Blazor Server Side in C#?

    // In a Razor component or code-behind protected override void OnInitialized() { var options = new CookieOptions { Expires = DateTime.Now.AddMinutes(20), IsEssential = true, SameSite = SameSiteMode.Lax // Set SameSite mode for session cookies }; HttpContext.Response.Cookies.Append("SessionCookie", "SessionCookieValue", options); }

    This code creates a session cookie named "SessionCookie" with specific options.

  9. How to create a cookie with custom domain and path in Blazor Server Side in C#?

    // In a Razor component or code-behind protected override void OnInitialized() { var options = new CookieOptions { Expires = DateTime.Now.AddHours(1), Domain = "yourdomain.com", // Set the custom domain Path = "/custompath" // Set the custom path }; HttpContext.Response.Cookies.Append("CustomCookie", "CustomCookieValue", options); }

    This code creates a cookie named "CustomCookie" with a custom domain and path.

  10. How to read and parse a JSON cookie in Blazor Server Side in C#?

    // In a Razor component or code-behind protected override void OnInitialized() { var jsonCookieValue = HttpContext.Request.Cookies["JsonCookie"]; if (!string.IsNullOrEmpty(jsonCookieValue)) { var parsedObject = JsonSerializer.Deserialize<MyCustomType>(jsonCookieValue); // Use parsedObject as needed } }

    This code reads a JSON-formatted cookie named "JsonCookie" and parses it into a custom C# object.

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