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You are currently looking at documentation for Umbraco 8 and older versions.
Go to docs.umbraco.com/umbraco-cms/fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/user-picker for documentation for Umbraco 9 and newer versions.

    User Picker

    Alias: Umbraco.UserPicker

    Returns: IPublishedContent

    The user picker opens a panel to pick a specific user from the Users section. The value saved is of type IPublishedContent.

    Data Type Definition Example

    Media Picker Data Type Definition

    Content Example

    Member Picker Content

    MVC View Example

    Please note that getting the Value of the property will return the user ID - properties of the User can be accessed by referencing UserService.

    Without Modelsbuilder

    @{
    if (Model.Value("userPicker") != null)
    {
        var us = Services.UserService;
        var username = us.GetUserById(Model.Value<int>("userPicker")).Name;

        <p>This is the chosen person: @username</p>
        <p>This returns the id value of chosen person: @Model.Value("userPicker")</p>
    }
}

    With Modelsbuilder

    @{
    if (Model.UserPicker != null)
    {

        var us = Services.UserService;
        var user = us.GetUserById((int)Model.UserPicker);

        <p>This is the chosen person: @user.Name</p>
        <p>This returns the id value of chosen person: @user.Id)</p>
    }
}

    Add values programmatically

    See the example below to see how a value can be added or changed programmatically. To update a value of a property editor you need the Content Service.

    @{
    // Get access to ContentService
    var contentService = Services.ContentService;

    // Create a variable for the GUID of the page you want to update
    var guid = new Guid("796a8d5c-b7bb-46d9-bc57-ab834d0d1248");
    
    // Get the page using the GUID you've defined
    var content = contentService.GetById(guid); // ID of your page

    // Set the value of the property with alias 'userPicker'. The value is the specific ID of the user
    content.SetValue("userPicker", -1);
            
    // Save the change
    contentService.Save(content);
}

    Although the use of a GUID is preferable, you can also use the numeric ID to get the page:

    @{
    // Get the page using it's id
    var content = contentService.GetById(1234); 
}

    If Modelsbuilder is enabled you can get the alias of the desired property without using a magic string:

    @{
    // Set the value of the property with alias 'userPicker'
    content.SetValue(Home.GetModelPropertyType(x => x.UserPicker).Alias, "Umbraco Demo");
}