/// <summary>
/// Appends the key expression for the given entity to the given <see cref="StringBuilder"/>
/// </summary>
/// <param name="entity">The entity to build the key expression from.</param>
/// <param name="builder">The builder to append onto.</param>
internal void AppendKeyExpression(IEdmStructuredValue entity, StringBuilder builder)
{
Debug.Assert(entity != null, "entity != null");
Debug.Assert(builder != null, "builder != null");
IEdmEntityTypeReference edmEntityTypeReference = entity.Type as IEdmEntityTypeReference;
if (edmEntityTypeReference == null || !edmEntityTypeReference.Key().Any())
{
throw Error.Argument(ErrorStrings.Content_EntityWithoutKey, "entity");
}
this.AppendKeyExpression(edmEntityTypeReference.Key().ToList(), p => p.Name, p => GetPropertyValue(entity.FindPropertyValue(p.Name), entity.Type), builder);
}