未使用来自客户端的数据初始化字典对象

Question

I am facing issue my server side dictionary object is not being initialized with data coming from client. What is wrong with of my following code? Do i need to mention more code here or someone can figure out based on the type of UserPermissions both on client and server side? Is my dictionary declaration on client side wrong?

This is my client side code which push dictionary objects in array and send to server,

$scope.studentDetail.UserPermissions = [];
var DataToBeSentToServer = { Key: Id, Value: [] };
for (var j in selectUsers) {
DataToBeSentToServer.Value.push(selectUsers[j].Id);
}
$scope.studentDetail.UserPermissions.push(DataToBeSentToServer);

Server Code: The class is being initialized outside

public class Test{
    public Dictionary<Guid, List<Guid>> UserPermissions { get; set; }
}

Answer 1

The JSON object you send to the server is not a dictionary. It is an object with two properties :

public class MyJsonObject
{
    public Guid Key {get; set;}
    public Guid[] Value {get; set;}
}

Answer 2

By default C# dictionary is being serialized into javascript object as it basically represents a hashmap. That means json output from your example Dictionary<Guid, List<Guid>> will look like:

{
   "85dad90f-...": [
          "413516ea-...",
          "a38473df-...",
          "bee09890-..."
   ],
   "39454a68-...": [
          "f5510938-...",
          "57260cb7-...",
          "ed201f04-..."
   ],
   "a7bc6a9e-...": [
          "77689b7c-...",
          "baf3f74b-...",
          "735f77eb-..."
   ]
}

Therefore for deserialization from js you will have to create similar data structure. Note code snippet below is just to give you an idea about implementation.

// assuming your data model looks like this:
var users = [{
    username : 'John Doe',
    userid : 'f5510938-...',
    permissions : [
        { permission : 'view-landing-page', permissionid : '57260cb7-...' }, ...
    ]
}, ...]


// your implementation might look like:
var permissions = {};  // to be sent to server

foreach (var userIndex in users) {
    var user = users[userIndex];
    var key = user.userid;        //  Dictionary<Guid, <- dictionary key 

    if (!permissions[key]) {
        permissions[key] = [];
    }

    foreach(pIndex in user.permissions) {
        var permission = user.permissions[pIndex];

        permissions[key].push(permission.permissionid);
    }
}