/// <summary>
/// Queries for the features that satisfies the attribute and/or spatial query as specified by an
/// <paramref name="filter" /> object
/// and executes the specified <paramref name="action" /> on each feature returned from the query.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="filter">The attribute and/or spatial requirement that the features must satisify.</param>
/// <param name="action">The action to take for each feature in the cursor.</param>
/// <param name="recycling">if set to <c>true</c> when a recycling memory for the features is used.</param>
/// <returns>
/// Returns a <see cref="int" /> representing the number of features affected by the action.
/// </returns>
/// <exception cref="System.ArgumentNullException">action</exception>
/// <exception cref="ArgumentNullException">action</exception>
public static int Fetch(this IFeatureClass source, IQueryFilter filter, Func <IFeature, bool> action, bool recycling)
{
if (source == null)
{
return(0);
}
if (action == null)
{
throw new ArgumentNullException("action");
}
int recordsAffected = 0;
using (ComReleaser cr = new ComReleaser())
{
IFeatureCursor cursor = source.Search(filter, recycling);
cr.ManageLifetime(cursor);
foreach (var feature in cursor.AsEnumerable())
{
if (!action(feature))
{
return(recordsAffected);
}
recordsAffected++;
}
}
return(recordsAffected);
}
/// <summary>
/// Queries for the features that satisfies the attribute and/or spatial query as specified by an
/// <paramref name="filter" /> object.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="filter">The attribute and/or spatial requirement that the features must satisify.</param>
/// <returns>
/// Returns a <see cref="List{IFeature}" /> representing the results of the query projected to the type.
/// </returns>
/// <exception cref="System.ArgumentNullException">filter</exception>
public static IList <IFeature> Fetch(this IFeatureClass source, IQueryFilter filter)
{
if (source == null)
{
return(null);
}
using (ComReleaser cr = new ComReleaser())
{
IFeatureCursor cursor = source.Search(filter, false);
cr.ManageLifetime(cursor);
return(cursor.AsEnumerable().ToList());
}
}
/// <summary>
/// Queries for the features that have the specified object ids.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="oids">The list of object ids.</param>
/// <returns>
/// Returns a <see cref="List{IFeature}" /> representing the features returned from the query.
/// </returns>
/// <exception cref="System.ArgumentNullException">oids</exception>
public static IList <IFeature> Fetch(this IFeatureClass source, params int[] oids)
{
if (source == null)
{
return(null);
}
if (oids == null)
{
throw new ArgumentNullException("oids");
}
using (ComReleaser cr = new ComReleaser())
{
IFeatureCursor cursor = source.GetFeatures(oids, false);
cr.ManageLifetime(cursor);
return(cursor.AsEnumerable().ToList());
}
}
/// <summary>
/// Queries for the features that satisfies the attribute and/or spatial query as specified by an
/// <paramref name="filter" /> object and projects the results into a new form.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <param name="source">The source.</param>
/// <param name="filter">The attribute and/or spatial requirement that the features must satisify.</param>
/// <param name="selector">Projects each element of a sequence into a new form.</param>
/// <returns>
/// Returns a <see cref="List{TResult}" /> representing the results of the query projected to the type.
/// </returns>
/// <exception cref="System.ArgumentNullException">
/// filter
/// or
/// selector
/// </exception>
public static IList <TResult> Fetch <TResult>(this IFeatureClass source, IQueryFilter filter, Func <IFeature, TResult> selector)
{
if (source == null)
{
return(null);
}
if (selector == null)
{
throw new ArgumentNullException("selector");
}
using (ComReleaser cr = new ComReleaser())
{
IFeatureCursor cursor = source.Search(filter, false);
cr.ManageLifetime(cursor);
return(cursor.AsEnumerable().Select(selector).ToList());
}
}
