本文整理汇总了C#中System.Data.DataRow.GetRecordFromVersion方法的典型用法代码示例。如果您正苦于以下问题:C# DataRow.GetRecordFromVersion方法的具体用法?C# DataRow.GetRecordFromVersion怎么用?C# DataRow.GetRecordFromVersion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.GetRecordFromVersion方法的9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: SilentlySetValue
internal void SilentlySetValue(DataRow dr, DataColumn dc, DataRowVersion version, object newValue) {
// get record for version
int record = dr.GetRecordFromVersion(version);
bool equalValues = false;
if (DataStorage.IsTypeCustomType(dc.DataType) && newValue != dc[record]) {
// if UDT storage, need to check if reference changed. See bug 385182
equalValues = false;
}
else {
equalValues = dc.CompareValueTo(record, newValue, true);
}
// if expression has changed
if (!equalValues) {
int[] oldIndex = dr.Table.RemoveRecordFromIndexes(dr, version);// conditional, if it exists it will try to remove with no event fired
dc.SetValue(record, newValue);
int[] newIndex = dr.Table.InsertRecordToIndexes(dr, version);// conditional, it will insert if it qualifies, no event will be fired
if (dr.HasVersion(version)) {
if (version != DataRowVersion.Original) {
dr.Table.RecordChanged(oldIndex, newIndex);
}
if (dc.dependentColumns != null) {
//BugBug - passing in null for cachedRows. This means expression columns as keys does not work when key changes.
dc.Table.EvaluateDependentExpressions(dc.dependentColumns, dr, version, null);
}
}
}
dr.ResetLastChangedColumn();
}
示例2: Eval
internal override object Eval(DataRow row, DataRowVersion version) {
if (!found) {
throw ExprException.UnboundName(name);
}
if (row == null) {
if(IsTableConstant()) // this column is TableConstant Aggregate Function
return column.DataExpression.Evaluate();
else {
throw ExprException.UnboundName(name);
}
}
return column[row.GetRecordFromVersion(version)];
}
示例3: RemoveRecordFromIndexes
// RemoveRecordFromIndexes removes the given record (using row and version) from all indexes and it stores and returns the position of deleted
// record from each index
// IT SHOULD NOT CAUSE ANY EVENT TO BE FIRED
internal int[] RemoveRecordFromIndexes(DataRow row, DataRowVersion version) {
int indexCount = LiveIndexes.Count;
int [] positionIndexes = new int[indexCount];
int recordNo = row.GetRecordFromVersion(version);
DataViewRowState states = row.GetRecordState(recordNo);
while (--indexCount >= 0) {
if (row.HasVersion(version) && ((states & indexes[indexCount].RecordStates) != DataViewRowState.None)) {
int index = indexes[indexCount].GetIndex(recordNo);
if (index > -1) {
positionIndexes [indexCount] = index;
indexes[indexCount].DeleteRecordFromIndex(index); // this will delete the record from index and MUSt not fire event
}
else {
positionIndexes [indexCount] = -1; // this means record was not in index
}
}
else {
positionIndexes [indexCount] = -1; // this means record was not in index
}
}
return positionIndexes;
}
示例4: InsertRecordToIndexes
// InsertRecordToIndexes inserts the given record (using row and version) to all indexes and it stores and returns the position of inserted
// record to each index
// IT SHOULD NOT CAUSE ANY EVENT TO BE FIRED
internal int[] InsertRecordToIndexes(DataRow row, DataRowVersion version) {
int indexCount = LiveIndexes.Count;
int [] positionIndexes = new int[indexCount];
int recordNo = row.GetRecordFromVersion(version);
DataViewRowState states = row.GetRecordState(recordNo);
while (--indexCount >= 0) {
if (row.HasVersion(version)) {
if ((states & indexes[indexCount].RecordStates) != DataViewRowState.None) {
positionIndexes [indexCount] = indexes[indexCount].InsertRecordToIndex(recordNo);
}
else {
positionIndexes [indexCount] = -1;
}
}
}
return positionIndexes;
}
示例5: Eval
internal override object Eval(DataRow row, DataRowVersion version)
{
if (!this.found)
{
throw ExprException.UnboundName(this.name);
}
if (row != null)
{
return this.column[row.GetRecordFromVersion(version)];
}
if (!this.IsTableConstant())
{
throw ExprException.UnboundName(this.name);
}
return this.column.DataExpression.Evaluate();
}
示例6: GetColumnValueAsString
// Return the field value as a string. If the field value is NULL, then NULL is return.
// If the column type is string and it's value is empty, then the empty string is returned.
// If the column type is not string, or the column type is string and the value is not empty string, then a non-empty string is returned
// This method does not throw any formatting exceptions, since we can always format the field value to a string.
internal string GetColumnValueAsString(DataRow row, DataRowVersion version)
{
object objValue = this[row.GetRecordFromVersion(version)];
if (DataStorage.IsObjectNull(objValue))
{
return null;
}
string value = ConvertObjectToXml(objValue);
Debug.Assert(value != null);
return value;
}
示例7: SilentlySetValue
internal void SilentlySetValue(DataRow dr, DataColumn dc, DataRowVersion version, object newValue)
{
int recordFromVersion = dr.GetRecordFromVersion(version);
bool flag = false;
if (DataStorage.IsTypeCustomType(dc.DataType) && (newValue != dc[recordFromVersion]))
{
flag = false;
}
else
{
flag = dc.CompareValueTo(recordFromVersion, newValue, true);
}
if (!flag)
{
int[] oldIndex = dr.Table.RemoveRecordFromIndexes(dr, version);
dc.SetValue(recordFromVersion, newValue);
int[] newIndex = dr.Table.InsertRecordToIndexes(dr, version);
if (dr.HasVersion(version))
{
if (version != DataRowVersion.Original)
{
dr.Table.RecordChanged(oldIndex, newIndex);
}
if (dc.dependentColumns != null)
{
dc.Table.EvaluateDependentExpressions(dc.dependentColumns, dr, version, null);
}
}
}
dr.ResetLastChangedColumn();
}
示例8: RemoveRecordFromIndexes
internal int[] RemoveRecordFromIndexes(DataRow row, DataRowVersion version)
{
int count = this.LiveIndexes.Count;
int[] numArray = new int[count];
int recordFromVersion = row.GetRecordFromVersion(version);
DataViewRowState recordState = row.GetRecordState(recordFromVersion);
while (--count >= 0)
{
if (row.HasVersion(version) && ((recordState & this.indexes[count].RecordStates) != DataViewRowState.None))
{
int index = this.indexes[count].GetIndex(recordFromVersion);
if (index > -1)
{
numArray[count] = index;
this.indexes[count].DeleteRecordFromIndex(index);
}
else
{
numArray[count] = -1;
}
}
else
{
numArray[count] = -1;
}
}
return numArray;
}
示例9: InsertRecordToIndexes
internal int[] InsertRecordToIndexes(DataRow row, DataRowVersion version)
{
int count = this.LiveIndexes.Count;
int[] numArray = new int[count];
int recordFromVersion = row.GetRecordFromVersion(version);
DataViewRowState recordState = row.GetRecordState(recordFromVersion);
while (--count >= 0)
{
if (row.HasVersion(version))
{
if ((recordState & this.indexes[count].RecordStates) != DataViewRowState.None)
{
numArray[count] = this.indexes[count].InsertRecordToIndex(recordFromVersion);
}
else
{
numArray[count] = -1;
}
}
}
return numArray;
}