[英]Insert a Row in Existing DataTable
我尝试了一种用于询问问题的方法。
public DataTable allSupportPoints(DataTable createPath, double rMax, double interval, int curveType)
{
List <DataTable> theCornerCurves = cornerCurves(createPath, rMax, interval, curveType);
DataTable curvePoints = CustomMerge(theCornerCurves);
double X1 = Convert.ToDouble(createPath.Rows[0][1]);
double Y1 = Convert.ToDouble(createPath.Rows[0][2]);
double X2, Y2;
int count = curvePoints.Rows.Count;
double theDistance;
int pointInsert;
for (int i = 0; i < count;)
{
X2 = Convert.ToDouble(theCornerCurves[i].Rows[0][0]);
Y2 = Convert.ToDouble(theCornerCurves[i].Rows[0][0]);
theDistance = distance(X1,Y1,X2,Y2);
int j=0;
if ( theDistance> interval)
{
pointInsert = Convert.ToInt32 (theDistance / interval);
DataTable temp = straightLineGenerator(X1, Y1, X2, Y2,interval);
for (j = 0; j < temp.Rows.Count; j++)
{
var rowTemp = temp.NewRow();
rowTemp.ItemArray = temp.Rows[j].ItemArray.Clone() as object[];
curvePoints.Rows.InsertAt(rowTemp, i + j);
}
}
X1=Convert.ToDouble(curvePoints.Rows[i+j][0]);
Y1 = 0;
count = curvePoints.Rows.Count;
i = i + 1;
}
return curvePoints;
}
我收到此运行时错误:此行已经属于另一个表。 我尝试了不同的方法来插入,但错误是相同的,我也提到了一些帖子,但它似乎不起作用,请帮助!!
更改此:
var rowTemp = temp.NewRow();
对此:
var rowTemp = curvePoints.NewRow();
实际上,该行必须由要添加的同一表创建
您的代码的这一部分:
for (j = 0; j < temp.Rows.Count; j++)
{
var rowTemp = temp.NewRow();
rowTemp.ItemArray = temp.Rows[j].ItemArray.Clone() as object[];
curvePoints.Rows.InsertAt(rowTemp, i + j);
}
是不正确的。 首先,您要向temp
添加新行,然后尝试将其插入curvePoints
。 由于它已经属于temp
-您遇到了提到的异常。
该代码可以简化为
for (j = 0; j < temp.Rows.Count; j++)
curvePoints.ImportRow(temp.Rows[j]);
但请注意: ImportRow
将行插入到最后一个位置,因此,如果您确实需要像执行操作那样将行插入到特定位置,则只需保持代码不变,只需更改var rowTemp = temp.NewRow();
到var rowTemp = curvePoints.NewRow();
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