How to store list of object into ViewState using C#

How to store list of object into ViewState using C#

In C#, you can store a list of objects in ViewState by serializing it to a string and then assigning the string value to ViewState. Here is an example code snippet that demonstrates how to store a list of objects in ViewState:

List<MyObject> myList = new List<MyObject>(); // Add objects to the list... // Serialize the list to a string string serializedList = JsonConvert.SerializeObject(myList); // Store the serialized string in ViewState ViewState["MyList"] = serializedList;

In this example, we first create a new list of MyObject objects and add some objects to the list. We then use the JsonConvert.SerializeObject() method from the Newtonsoft.Json NuGet package to serialize the list to a JSON string.

Finally, we store the serialized string in ViewState by assigning it to a key-value pair in the ViewState dictionary. In this example, we use the key "MyList" to store the serialized string, but you can use any key name you like.

To retrieve the list of objects from ViewState, you would reverse the process by retrieving the serialized string from ViewState, deserializing it back into a list of objects, and casting the result to the appropriate data type:

// Retrieve the serialized string from ViewState string serializedList = ViewState["MyList"] as string; // Deserialize the string back into a list of objects List<MyObject> myList = JsonConvert.DeserializeObject<List<MyObject>>(serializedList);

In this example, we retrieve the serialized string from ViewState using the same key name that we used to store it. We then use the JsonConvert.DeserializeObject() method to deserialize the string back into a list of MyObject objects.

Note that you will need to include a reference to the Newtonsoft.Json NuGet package in your project in order to use the JsonConvert methods.

Examples

  1. "C# ViewState store list of objects example"

    • Description: Learn how to store a list of objects into ViewState in a C# application.
    • Code:
      // Store list of objects into ViewState List<MyObject> myList = // Your list of objects ViewState["MyListKey"] = myList;

  2. "C# serialize list of objects into ViewState"

    • Description: Understand how to serialize and store a list of objects into ViewState in C#.
    • Code:
      // Serialize and store list of objects into ViewState List<MyObject> myList = // Your list of objects string serializedList = JsonConvert.SerializeObject(myList); ViewState["MyListKey"] = serializedList;

  3. "ViewState management for list of objects in C#"

    • Description: Explore best practices for managing and storing a list of objects in ViewState in C#.
    • Code:
      // Store list of objects into ViewState using a property public List<MyObject> MyList { get { return ViewState["MyListKey"] as List<MyObject>; } set { ViewState["MyListKey"] = value; } }

  4. "C# GridView store list of objects in ViewState"

    • Description: Learn how to store a list of objects and bind it to a GridView using ViewState in C#.
    • Code:
      // Store list of objects into ViewState and bind to GridView List<MyObject> myList = // Your list of objects ViewState["MyListKey"] = myList; GridView1.DataSource = myList; GridView1.DataBind();

  5. "ViewState vs Session for storing list of objects in C#"

    • Description: Compare using ViewState and Session for storing a list of objects in a C# application.
    • Code:
      // Using ViewState List<MyObject> myList = // Your list of objects ViewState["MyListKey"] = myList; // Using Session Session["MyListKey"] = myList;

  6. "C# strongly typed ViewState for list of objects"

    • Description: Implement strongly typed ViewState to store a list of objects in C#.
    • Code:
      // Strongly typed ViewState property for list of objects public List<MyObject> MyList { get { return ViewState["MyListKey"] as List<MyObject>; } set { ViewState["MyListKey"] = value; } }

  7. "C# ViewState store complex objects example"

    • Description: Understand how to store a list of complex objects in ViewState in a C# application.
    • Code:
      // Store list of complex objects into ViewState List<MyComplexObject> myList = // Your list of complex objects ViewState["MyListKey"] = myList;

  8. "C# serialize and deserialize ViewState list of objects"

    • Description: Learn how to serialize and deserialize a list of objects stored in ViewState in C#.
    • Code:
      // Serialize list of objects into ViewState List<MyObject> myList = // Your list of objects string serializedList = JsonConvert.SerializeObject(myList); ViewState["MyListKey"] = serializedList; // Deserialize from ViewState List<MyObject> deserializedList = JsonConvert.DeserializeObject<List<MyObject>>(ViewState["MyListKey"].ToString());

  9. "ViewState lifecycle in C# with list of objects"

    • Description: Explore the lifecycle of ViewState in C# and how to manage a list of objects across postbacks.
    • Code:
      // Check if ViewState contains the list before accessing if (ViewState["MyListKey"] != null) { List<MyObject> myList = ViewState["MyListKey"] as List<MyObject>; // Your code here }

  10. "C# dynamically add and remove objects in ViewState list"

    • Description: Learn how to dynamically add and remove objects from a list stored in ViewState in C#.
    • Code:
      // Add an object to the list in ViewState List<MyObject> myList = ViewState["MyListKey"] as List<MyObject>; myList.Add(new MyObject()); // Remove an object from the list in ViewState myList.RemoveAt(index); // Replace 'index' with the desired index

More Tags

twitter-bootstrap-4 informix exif react-table modelstate word-style oracle-manageddataaccess git-revert image-recognition android-gradle-plugin

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