/// <summary>
/// Updates the DataGrid's validation results, modifies the ValidationSummary's items,
/// and sets the IsValid states of the UIElements.
/// </summary>
/// <param name="newValidationResults">New validation results.</param>
/// <param name="scrollIntoView">If the validation results have changed, scrolls the editing row into view.</param>
private void UpdateValidationResults(List<ValidationResult> newValidationResults, bool scrollIntoView)
{
bool validationResultsChanged = false;
Debug.Assert(this.EditingRow != null);
// Remove the validation results that have been fixed
List<ValidationResult> removedValidationResults = new List<ValidationResult>();
foreach (ValidationResult oldValidationResult in this._validationResults)
{
if (oldValidationResult != null && !newValidationResults.ContainsEqualValidationResult(oldValidationResult))
{
removedValidationResults.Add(oldValidationResult);
validationResultsChanged = true;
}
}
foreach (ValidationResult removedValidationResult in removedValidationResults)
{
this._validationResults.Remove(removedValidationResult);
if (this._validationSummary != null)
{
ValidationSummaryItem removedValidationSummaryItem = this.FindValidationSummaryItem(removedValidationResult);
if (removedValidationSummaryItem != null)
{
this._validationSummary.Errors.Remove(removedValidationSummaryItem);
}
}
}
// Add any validation results that were just introduced
foreach (ValidationResult newValidationResult in newValidationResults)
{
if (newValidationResult != null && !this._validationResults.ContainsEqualValidationResult(newValidationResult))
{
this._validationResults.Add(newValidationResult);
if (this._validationSummary != null && ShouldDisplayValidationResult(newValidationResult))
{
ValidationSummaryItem newValidationSummaryItem = this.CreateValidationSummaryItem(newValidationResult);
if (newValidationSummaryItem != null)
{
this._validationSummary.Errors.Add(newValidationSummaryItem);
}
}
validationResultsChanged = true;
}
}
if (validationResultsChanged)
{
this.UpdateValidationStatus();
}
if (!this.IsValid && scrollIntoView)
{
// Scroll the row with the error into view.
int editingRowSlot = this.EditingRow.Slot;
if (this._validationSummary != null)
{
// If the number of errors has changed, then the ValidationSummary will be a different size,
// and we need to delay our call to ScrollSlotIntoView
this.InvalidateMeasure();
this.Dispatcher.BeginInvoke(delegate
{
// It's possible that the DataContext or ItemsSource has changed by the time we reach this code,
// so we need to ensure that the editing row still exists before scrolling it into view
if (!this.IsSlotOutOfBounds(editingRowSlot))
{
this.ScrollSlotIntoView(editingRowSlot, false /*scrolledHorizontally*/);
}
});
}
else
{
this.ScrollSlotIntoView(editingRowSlot, false /*scrolledHorizontally*/);
}
}
}
private bool ValidateEditingRow()
{
if (this.EditingRow != null)
{
List<ValidationResult> newValidationResults = new List<ValidationResult>();
ValidationContext context = new ValidationContext(this.EditingRow.DataContext, null, null);
if (!Validator.TryValidateObject(this.EditingRow.DataContext, context, newValidationResults, true))
{
bool validationResultsChanged = false;
// Remove the validation results that have been fixed
List<ValidationResult> removedValidationResults = new List<ValidationResult>();
foreach (ValidationResult oldValidationResult in this._validationResults)
{
if (oldValidationResult != null && !newValidationResults.ContainsEqualValidationResult(oldValidationResult))
{
removedValidationResults.Add(oldValidationResult);
validationResultsChanged = true;
}
}
foreach (ValidationResult removedValidationResult in removedValidationResults)
{
this._validationResults.Remove(removedValidationResult);
if (this._validationSummary != null)
{
ValidationSummaryItem removedValidationSummaryItem = this.FindValidationSummaryItem(removedValidationResult);
if (removedValidationSummaryItem != null)
{
this._validationSummary.Errors.Remove(removedValidationSummaryItem);
}
}
}
// Add any validation results that were just introduced
foreach (ValidationResult newValidationResult in newValidationResults)
{
if (newValidationResult != null && !this._validationResults.ContainsEqualValidationResult(newValidationResult))
{
this._validationResults.Add(newValidationResult);
if (this._validationSummary != null)
{
ValidationSummaryItem newValidationSummaryItem = this.CreateValidationSummaryItem(newValidationResult);
if (newValidationSummaryItem != null)
{
this._validationSummary.Errors.Add(newValidationSummaryItem);
}
}
validationResultsChanged = true;
}
}
// Scroll the row with the error into view
int editingRowSlot = this.EditingRow.Slot;
if (validationResultsChanged && this._validationSummary != null)
{
// If the number of errors has changed, then the ValidationSummary will be a different size,
// and we need to delay our call to ScrollSlotIntoView
this.InvalidateMeasure();
this.Dispatcher.BeginInvoke(delegate
{
// It's possible that the DataContext or ItemsSource has changed by the time we reach this code,
// so we need to ensure that the editing row still exists before scrolling it into view
if (!this.IsSlotOutOfBounds(editingRowSlot))
{
this.ScrollSlotIntoView(editingRowSlot, false /*scrolledHorizontally*/);
}
});
}
else
{
this.ScrollSlotIntoView(editingRowSlot, false /*scrolledHorizontally*/);
}
this.IsValid = this.EditingRow.IsValid = false;
this.EditingRow.ApplyState(true);
return false;
}
}
// No validation errors, so reset the status
ResetValidationStatus();
return true;
}
