本文整理汇总了C#中System.Data.DataRow.HasChanges方法的典型用法代码示例。如果您正苦于以下问题：C# DataRow.HasChanges方法的具体用法？C# DataRow.HasChanges怎么用？C# DataRow.HasChanges使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Data.DataRow的用法示例。
在下文中一共展示了DataRow.HasChanges方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: SetDataRowWithLoadOption
//.........这里部分代码省略.........
try {
drcevent = RaiseRowChanging(null, dataRow, action);
if (action == DataRowAction.Nothing) { // RaiseRowChanging does not fire for DataRowAction.Nothing
dataRow.inChangingEvent = true;
try {
drcevent = OnRowChanging(drcevent, dataRow, action);
}
finally {
dataRow.inChangingEvent = false;
}
}
}
finally {
Debug.Assert(dataRow.tempRecord == recordNo, "tempRecord has been changed in event handler");
if (DataRowState.Detached == dataRow.RowState) {
// 'row.Table.Remove(row);'
if (-1 != cacheTempRecord) {
FreeRecord(ref cacheTempRecord);
}
}
else {
if (dataRow.tempRecord != recordNo) {
// 'row.EndEdit(); row.BeginEdit(); '
if (-1 != cacheTempRecord) {
FreeRecord(ref cacheTempRecord);
}
if (-1 != recordNo) {
FreeRecord(ref recordNo);
}
recordNo = dataRow.tempRecord;
}
else {
dataRow.tempRecord = cacheTempRecord;
}
}
}
if (dataRow.tempRecord != -1) {
dataRow.CancelEdit();
}
switch(loadOption) {
case LoadOption.OverwriteChanges:
this.SetNewRecord(dataRow, recordNo, DataRowAction.Change, false, false);
this.SetOldRecord(dataRow, recordNo);
break;
case LoadOption.Upsert:
if (dataRow.RowState == DataRowState.Unchanged) {
this.SetNewRecord(dataRow, recordNo, DataRowAction.Change, false, false);
if (!dataRow.HasChanges()) {
this.SetOldRecord(dataRow, recordNo);
}
}
else {
if (dataRow.RowState == DataRowState.Deleted)
dataRow.RejectChanges();
this.SetNewRecord(dataRow, recordNo, DataRowAction.Change, false, false);
}
break;
case LoadOption.PreserveChanges:
if (dataRow.RowState == DataRowState.Unchanged) {
// SQLBU 500706: DataTable internal index is corrupted: '8'
// if ListChanged event deletes dataRow
this.SetOldRecord(dataRow, recordNo); // do not fire event
this.SetNewRecord(dataRow, recordNo, DataRowAction.Change, false, false);
}
else { // if modified/ added / deleted we want this operation to fire event (just for LoadOption.PreserveCurrentValues)
this.SetOldRecord(dataRow, recordNo);
}
break;
default:
throw ExceptionBuilder.ArgumentOutOfRange("LoadOption");
}
if (hasError) {
string error = Res.GetString(Res.Load_ReadOnlyDataModified);
if (dataRow.RowError.Length == 0) { // WebData 112272, append the row error
dataRow.RowError = error;
}
else {
dataRow.RowError += " ]:[ " + error ;
}
foreach(DataColumn dc in this.Columns) {
if (dc.ReadOnly && !dc.Computed)
dataRow.SetColumnError(dc, error);
}
}
drcevent = RaiseRowChanged(drcevent, dataRow, action);
if (action == DataRowAction.Nothing) { // RaiseRowChanged does not fire for DataRowAction.Nothing
dataRow.inChangingEvent = true;
try {
OnRowChanged(drcevent, dataRow, action);
}
finally {
dataRow.inChangingEvent = false;
}
}
}示例2: SetDataRowWithLoadOption
//.........这里部分代码省略.........
finally
{
if (DataRowState.Detached == dataRow.RowState)
{
if (-1 != tempRecord)
{
this.FreeRecord(ref tempRecord);
}
}
else if (dataRow.tempRecord != recordNo)
{
if (-1 != tempRecord)
{
this.FreeRecord(ref tempRecord);
}
if (-1 != recordNo)
{
this.FreeRecord(ref recordNo);
}
recordNo = dataRow.tempRecord;
}
else
{
dataRow.tempRecord = tempRecord;
}
}
if (dataRow.tempRecord != -1)
{
dataRow.CancelEdit();
}
switch (loadOption)
{
case LoadOption.OverwriteChanges:
this.SetNewRecord(dataRow, recordNo, DataRowAction.Change, false, false, false);
this.SetOldRecord(dataRow, recordNo);
break;
case LoadOption.PreserveChanges:
if (dataRow.RowState != DataRowState.Unchanged)
{
this.SetOldRecord(dataRow, recordNo);
break;
}
this.SetOldRecord(dataRow, recordNo);
this.SetNewRecord(dataRow, recordNo, DataRowAction.Change, false, false, false);
break;
case LoadOption.Upsert:
if (dataRow.RowState != DataRowState.Unchanged)
{
if (dataRow.RowState == DataRowState.Deleted)
{
dataRow.RejectChanges();
}
this.SetNewRecord(dataRow, recordNo, DataRowAction.Change, false, false, false);
break;
}
this.SetNewRecord(dataRow, recordNo, DataRowAction.Change, false, false, false);
if (!dataRow.HasChanges())
{
this.SetOldRecord(dataRow, recordNo);
}
break;
default:
throw ExceptionBuilder.ArgumentOutOfRange("LoadOption");
}
if (flag)
{
string error = System.Data.Res.GetString("Load_ReadOnlyDataModified");
if (dataRow.RowError.Length == 0)
{
dataRow.RowError = error;
}
else
{
dataRow.RowError = dataRow.RowError + " ]:[ " + error;
}
foreach (DataColumn column2 in this.Columns)
{
if (column2.ReadOnly && !column2.Computed)
{
dataRow.SetColumnError(column2, error);
}
}
}
args = this.RaiseRowChanged(args, dataRow, nothing);
if (nothing == DataRowAction.Nothing)
{
dataRow.inChangingEvent = true;
try
{
this.OnRowChanged(args, dataRow, nothing);
}
finally
{
dataRow.inChangingEvent = false;
}
}
}