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How to return a list of model items to an ASP.NET Core SelectListItem?


By : user2175164
Date : October 16 2020, 08:10 AM
around this issue I have a model defined as: , you should fill your model , i think you return an empty model
code :
public async Task<IActionResult> Index()
{
        List<MessageModel> models =await ListTemplatesAsync();
        await StartEnvironmentAsync();
        return View(models);
}
private async Task<List<MessageModel>> ListTemplatesAsync(List<MessageModel> models)
{
    var response = await GetEnvironments.OnMessageReceiptAsync();
    List<MessageModel> models = new List<MessageModel>();
    foreach (var msg in response)
    {
        models.Add(new MessageModel(msg.MessageId, msg.Body, msg.MessageAttributes, msg.ReceiptHandle));
    }
    return models ;
}


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Entity Framework Generate List<SelectListItem> of unique values from model


By : Lemon Tiger
Date : March 29 2020, 07:55 AM
it should still fix some issue Yes, you are right about GroupBy, but then you will need to select only first values from groups:
code :
_context.Roles.GroupBy(r=> r.Organisation).Select(r = r.First())
_context.Roles.Select(r=> r.Organisation).Distinct()
_context.Roles.GroupBy(r=> r.Organisation).Select(r => 
{ 
    var organization = r.First();
    return new SelectListItem() { Name = organization , Value = organization }
}).ToList();
public static IEnumerable<SelectListItem> GetList<TEntity>(this IEnumerable<TEntity> collection, Expression<Func<TEntity, object>> keyExpression,
    Expression<Func<TEntity, object>> valueExpression, object selectedValue = null)
{
    var keyField = keyExpression.PropertyName();
    var valueField = valueExpression.PropertyName();

    return new SelectList(collection, keyField, valueField, selectedValue).ToList();
}
_context.Roles.Distinct(new OrganizationEqualityComparer()).GetList(o => o.Organization, o => o.Organization);
class RoleOrganizationComparer : IEqualityComparer<Role>
{
    public bool Equals(Role x, Role y)
    {
        if (Object.ReferenceEquals(x, y)) return true;
        if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null))
            return false;

        return x.Organization == y.Organization;
    }

    public int GetHashCode(Role role)
    {
        //Check whether the object is null 
        if (Object.ReferenceEquals(role, null)) return 0;

        //Get hash code for the Name field if it is not null. 
        return role.Organization == null ? 0 : role.Organization.GetHashCode();
    }
}

Razor model does not return list of items to controller


By : chinmay waghumbare
Date : March 29 2020, 07:55 AM
help you fix your problem I am new in MVC programming with razor and I need your advice on what is wrong with my code. , I would try doing Something like this.
code :
@for (int i = 0; i < Model.OrdItems.Count; i++)
{

@Html.DisplayFor(model => model.OrdItems[i].Id)@Html.HiddenFor(model => model.OrdItems[i].Id)
@Html.DisplayFor(model => model.OrdItems[i].StopAddressName)@Html.HiddenFor(model => model.OrdItems[i].StopAddressName)

}

How to create a generic method to populate List<SelectListItem> with specified model properties?


By : Zack
Date : March 29 2020, 07:55 AM
I wish this helpful for you To get property value using expression, you can Compile the expression, then you will have a Func, and you can execute that Func to get the value, like that:
code :
public List<SelectListItem> AllAsSelectListItemsSpecifyProperties(Expression<Func<T, string>> valueProperty, Expression<Func<T, string>> textProperty, string selectedValue = "")
{
    return AllAsQueryable().Select(i => new SelectListItem()
    {
        Value = GetPropertyValue(valueProperty),
        Text = GetPropertyValue(textProperty),
        Selected = (selectedValue == valueProperty)
    })
    .ToList();
}

private string GetPropertyValue(Expression<Func<T, string>> expression)
{
    return expression.Compile()(this).ToString();
}

How to properly assign values to a List of selectlistitem type model in MVC


By : Katherine Pair
Date : March 29 2020, 07:55 AM
This might help you For your scenario, the SelectList would be a better way to go, you would have to pass the sch list of your schedules object in the constructor of it and and specify the properties that which to be used as display text and which as value for it.
It would be something like:
code :
public class Stage
{
    public SelectList WarehouseSchedule { get; set; }
}
public ActionResult Stage()
{
    var sch = DataRepository.GetSchedules();
    var model = new Stage() 
           {
             WarehouseSchedule = new SelectList(sch,"ScheduleID","ScheduleName");
           };
    return View(model);
}

determine selected items in a List of SelectListItem using linq


By : Matt
Date : March 29 2020, 07:55 AM
may help you . I am attempting to use Linq to determine the selected item/s in a List of SelectListItem , Cast your expression before using Where
code :
var selected = ((List<SelectListItem>)ViewBag.EmployeeSupervisorUserId).Where(x => x.Selected);
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