This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 7 years ago.
I try to do something like that. When my employee does not have a particular value that it is not displayed. I tried to do it like this:
#foreach (var item in Model)
{
if (!item.Przewodnik.Uprawnienia.IsNullOrWhiteSpace()) {
<tr>
<td>
#Html.DisplayFor(modelItem => item.Przewodnik.Pracownik.Osoba.Imie)
</td>
(...)
But it give me a .NullReferenceException.
if(item.Przewodnik.Uprawnienia != null){...}
I tried this as well, but also give error.
Try the following:
#foreach (var item in Model)
{
if (item != null && item.Przewodnik != null && !string.IsNullOrEmpty(item.Przewodnik.Uprawnienia)) {
<tr>
<td>
#Html.DisplayFor(modelItem => item.Przewodnik.Pracownik.Osoba.Imie)
</td>
(...)
Related
I have problem with my nested foreach. As you see in the screenshot, it just returns all data in every dt.
I know how to solve my problem with a partial view. But I just want to know is there solution with foreach or some other loop.
public class VM
{
public IEnumerable<x> Upi { get; set; }
public IEnumerable<y> Adre { get; set; }
}
View
#foreach (var item in Model.Upi)
{
<tr>
<td>
#Html.DisplayFor(modelItem => item.Name)
</td>
<td>
#Html.DisplayFor(modelItem => item.Surname)
</td>
<td>
#foreach (var smece in Model.Adre)
{
<div>
<pre>
#Html.DisplayFor(modelItem => smece.Ul)
#Html.DisplayFor(modelItem => smece.Ku), #Html.DisplayFor(modelItem => smece.Gr)
</pre>
</div>
}
</td>
Sorry guys I am stupid. It was simple. I just had to put one if.
if (smece.AU_ID == item.AU_ID) before pre and it works. TY all. Now only problem is, is there maybe other way where it doesnt need to iterate whole foreach and just go to direct AU_ID.
This question already has answers here:
Conditionally change CSS class in Razor view
(4 answers)
Closed 5 years ago.
I have a For...Each loop of a list in an MVC View. What I need to do is look at a property to determine if the records has been marked as deleted and then I would set the Bootstrap class of "danger" on a table row.
I can do a look at the property and write our the table row for each condition but that seems like extra work. If I use the following code Razor doesn't like the fact that it can't see the initial tag. Any suggestions on how to cleanly accomplish this?
#foreach (var item in Model.MyList)
{
if (item.IsDeleted == 1)
{
#Html.Raw("<tr class='danger'>")
}
else
{
#Html.Raw("<tr>")
}
<td>#item.FirstName</td>
<td>#item.LastName</td>
<td>#item.EmployeeId</td>
</tr>
}
Here is the simpler way for your problem
#foreach (var item in Model.MyList)
{
<tr class="#(item.IsDeleted ? "danger" : string.Empty) ">
<td>#item.FirstName</td>
<td>#item.LastName</td>
<td>#item.EmployeeId</td>
</tr>
}
How about something like this?
#foreach (var item in Model.MyList)
{
<tr class="#(Model.deleted ? "danger" : "")">
<td>#item.FirstName</td>
<td>#item.LastName</td>
<td>#item.EmployeeId</td>
</tr>
}
You can simply work with it this way
#foreach (var item in Model.MyList)
{
if (item.IsDeleted == 1)
{
<tr class="danger">
<td>#item.FirstName</td>
<td>#item.LastName</td>
<td>#item.EmployeeId</td>
</tr>
}
else
{
<tr>
<td>#item.FirstName</td>
<td>#item.LastName</td>
<td>#item.EmployeeId</td>
</tr>
}
or an alternative is
#foreach (var item in Model.MyList)
{
<tr #(item.IsDeleted != 1 ? String.Empty : "class=\"danger\"" )>
<td>#item.FirstName</td>
<td>#item.LastName</td>
<td>#item.EmployeeId</td>
</tr>
}
Depending on my record, I'd like to change the style of the table row in my current iteration.
The below example doesn't work, but how would I go about doing this correctly?
foreach (var item in Model)
{
#{
if (item.DataState != DataState.Active)
{
<tr style="background-color: red">
}
else
<tr>
}
<td>#item.Name</td>
</tr>
}
So effectively, I'd like to dynamically render the <tr> element differently based on the DataState of my model.
Here's a shorter approach:
#foreach (var item in Model)
{
<tr #(item.DataState != DataState.Active ? "style=background-color:red" : "")>
<td>#item.Name</td>
</tr>
}
Edit: Code fixed
There are multiple way you can write condition.
Option 1:
#foreach (var item in Model)
{
if (item.DataState != DataState.Active)
{
<tr style="background-color: red">
<td>#item.Name</td>
</tr>
}
else
{
<tr>
<td>#item.Name</td>
</tr>
}
}
Option 2:
#foreach (var item in Model)
{
<tr style="#( item.DataState != DataState.Active ? "background-color: red;" : "" )">
<td>#item.Name</td>
</tr>
}
Define the attributes in a variable. The razor parser will omit the attribute if its value is null
#foreach (var item in Model)
{
var attributes = item.DataState == DataState.Active ? null : "background-color: red";
<tr style=#attributes>
<td>#item.Name</td>
</tr>
}
Not sure what kind of error you faces right now, but i gess your problem is that Razor don't understand all cases of tricky html render.
You can force him to render html where you need with #: symbol for single string or <text> tag like this:
#foreach (var item in Model)
{
if (item.DataState != DataState.Active)
{
#: <tr style="background-color: red">
}
else
{
<text><tr></text>
}
<td>#item.Name</td>
</tr>
}
You're probably going to get compile errors if you start splitting the <tr> tag up in the view and I'd not duplicate large chunks of code. I would do the following:
#foreach(var item in Model) {
string strStyle=String.Empty;
if(item.DataState!=DataState.Active) { strStyle = "background-color:red;" }
<text>
<tr style="#strStyle">
<td>#item.Name</td>
</tr>
</text>
}
#(item.DataState != DataState.Active ? "style=" + "background-color:red" : "")
#(!string.IsNullOrWhiteSpace(Model?.District?.Name) ? Html.Raw($"<span class=\"location\">{Model?.District?.Name}</span>") : string.Empty)
I have a collection of strings that are repeated in MVC3 Razor with the following code:
#if (Model.Publications != null)
{
<tr>
<th>Publications</th>
<td>
#foreach (var publication in #Model.Publications)
{
<text>#publication.Title</text>
}
</td>
</tr>
}
Now when I display this, all I get is:
Book1Book2Book3
But I really want is something like this:
Book1, Book2, Book3
Is there a simple way in MVC razor to achieve this without having to combine 'if' and 'foreach' statements?
#string.Join(",",Model.Publications.Select(p=>"<text>"+ p.Title+ "</text>"))
string.Join(", ", model.Publications.Select(pub => pub.Title).ToArray())
#if (Model.Publications != null)
{
<tr>
<th>Publications</th>
<td>
#var first = true
#foreach (var publication in #Model.Publications)
{
<text>#string.format("{0}{1}", first ? "" : ", ", publication.Title)</text>
#first = false;
}
</td>
</tr>
}
I get a "NullReferenceException was unhandled by user code" error with the following code in my View when I pass in a null value via my controller. There are situations where I want to pass in a null value, but I do not want an error thrown when this happens. What should I change my code to?
Originally my code was:
#foreach (var item in Model.MyModelStuff)
{
<tr>
<td>
#Html.DisplayFor(modelItem => item.Bla.Title)
</td>
<tr>
}
I have tried the following with no success:
#foreach (var item in Model.MyModelStuff.Where( item => item.MyModelStuff != null))
etc. . .
How do I change the code so that it will handle null without throwing an error? I've read I may need to be returning an empty collection of my model (?), how would I go about doing that - if it is indeed the necessary thing to do?
If my understanding is correct your collection is null.
A collection should never be null, like you said you should return an empty collection instead and prevent your collection to be corrupted not exposing the real collection:
public IList<Employee> Employees
{
get;
private set;
}
And initialize your collection inside the constructor
this.Employees = new List<Employee>();
Honestly, I think a null model is a poor choice. But if you insist, just add an if check:
#if (Model != null) {
foreach (var item in Model.MyModelStuff)
{
<tr>
<td>
#Html.DisplayFor(modelItem => item.Bla.Title)
</td>
<tr>
}
}