Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Enumerators in C# don't do what you think they do. They're used to go over collections of items, like arrays, lists or other objects that implement the <code>IEnumerable</code> interface, either explicitly or implicitly. They're not used to iterate over the fields of a struct. </p> <p>There are two ways of doing what you want. The first is to override the <code>ToString</code> method in your <code>ColumnSpec</code> struct. <code>ToString()</code> is a standard method shared by all types in .NET, and provides the print-out logic for your type. Since it's implemented inside your code, you can reference your fields explicitly and create a single string from them all.</p> <p>If you're looking for a generic solution after all, you'll have to look into <a href="http://msdn.microsoft.com/en-us/library/f7ykdhsy%28v=vs.110%29.aspx" rel="nofollow">Reflection</a>, which lets you examine the fields and properties of a struct at runtime, and has similar syntax to what you've tried:</p> <pre><code>ColumnSpec computed; // your instance. Type myType = typeof(ColumnSpec); The reflected Type of ColumnSpec. string combinedString = ""; foreach (FieldInfo field in myType.GetFields()) // this enumerates all public fields. { if (field.FieldType == typeof(string)) // only for strings { string fieldValue = field.GetValue(computed); // extract the value. combinedString += fieldValue; } } </code></pre> <p>This is a simplified example, but it should get you started with Reflection. A more comprehensive solution will have you drill down deeper, using reflection, into the array of <code>Column</code> objects, extracting the data from them as well.</p> <p>A third option, as mentioned in the comments by @Corak, will allow you to expose your values as an enumerator, maintaining their order, but without reflection, by adding the following method to your struct:</p> <pre><code>public IEnumerable&lt;string&gt; GetElements() { yield return specName; yield return delimiters; . . . // you get the idea. foreach (Column column in Columns) { yield return column.Name; } yield return testrangefile.Filename; } </code></pre> <p>This will expose an IEnumerable of strings, while explicitly <a href="http://msdn.microsoft.com/en-us/library/vstudio/9k7k7cf0.aspx" rel="nofollow"><code>yield</code>ing</a> allows you to fill this enumerable lazily, in the order you want. You can then call it like this:</p> <pre><code>foreach (string element in computed.GetElements()) { } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POError in C# get enumerator definition
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USAvner Shahar-Kashtan
    1. USAvner Shahar-Kashtan
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

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