Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>If column doesn't have <code>DisplayMemberBinding</code> or <code>CellTemplate</code> then ToString is called on each item in the grid and evaluated value is used as cell content.</p> <p>For example, if you have class:</p> <pre><code>public class Person { public string FirstName { get; set; } public string LastName { get; set; } public override string ToString() { return LastName; } } </code></pre> <p>If you bind a collection of <code>Person</code> to the grid view:</p> <pre><code>var people = new List&lt;Person&gt; { new Person { FirstName = "Peter", LastName = "Smith" }, new Person { FirstName = "Steve", LastName = "White" }, new Person { FirstName = "Dave", LastName = "Gates" }, }; listView1.ItemsSource = people; </code></pre> <p>And if you create a new column without binding, then LastName will be shown in this column, because overridden <code>ToString()</code> returns <code>LastName</code>. If you change <code>ToString</code> to return <code>FirstName</code> then new column will show <code>FirstName</code>.</p> <p>Hope I understood your question correctly.</p> <p><strong>[Edit]</strong></p> <p>If you add many new columns and don't use <code>DisplayMemberBinding</code> then all the new columns will evaluate and show <code>ToString()</code> result. You need to set <code>DisplayMemberBinding</code> to show particular property.</p> <pre><code>var newColumn = new GridViewColumn(); newColumn.Header = "Test"; newColumn.DisplayMemberBinding = new Binding("FirstName"); gridView.Columns.Add(newColumn); </code></pre> <p><strong>[Edit]</strong> Answers to your questions:</p> <blockquote> <p>When ToString() is called on every item (which represents a row), how is that mapped towards the columns of the GridView? How must I alter an item in the row so that the new column is filled?</p> </blockquote> <p>ToString is called when cell presenter is rendered, unless you specified binding or template, which would also use binding in the end. You cannot alter row item to control how it is represented in the grid, unless you override ToString or properties that are bound to the columns.</p> <p>Not sure I understand your problem completely. You are adding a new column, right? Why don't you set DisplayMemberBinding property on your column? If you do this you will be able to show in the column whatever you want.</p> <p><strong>[Edit]</strong></p> <p>I think I answered your bounty question :). I think I already earned the bounty :).</p> <p>However, here is the answer to your next question:</p> <blockquote> <blockquote> <p>How would I set DataMemberBinding to achieve mapping to ListRow.Items[5]?</p> </blockquote> </blockquote> <p>The answer:</p> <pre><code>newColumn.DisplayMemberBinding = new Binding("Items[5]"); </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POListView programatically added columns shows type of item
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USAlex Aza
    1. USAlex Aza
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POListView programatically added columns shows type of item
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COSo there must be a `DisplayMemberBinding` or a `CellTemplate` on the `GridViewColumn`-object? Otherwise `.ToString()` is called on the item (leading multiple new columns to all show the same content)? I'll try that out.
      singulars
      1. PO
      1. USZoolWay
    2. COThat is correct.
      singulars
      1. PO
      1. USAlex Aza
    3. COAre you sure that this are the only possiblities? In my case on the existing columns both, `DisplayMemberBinding` and `CellTemplate` are `null` but the columns got different contents.
      singulars
      1. PO
      1. USZoolWay
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload