Question

我指的是php中的一个教程。我正在转换成C＃。事情就是他们已经使用了

我的查询

SELECT ST_AsText(
  ST_Union(
    ST_Difference(
      ST_Buffer(ST_GeometryFromText('POINT(0 0)', 4326), 30),
      ST_Envelope(
        ST_Buffer(ST_GeometryFromText('POINT(0 0)', 4326), 10)
      )
    ),
    ST_Envelope(
        ST_Buffer(ST_GeometryFromText('POINT(-55 -55)', 4326), 10)
      )
  )
);

在postgresql中执行后的结果是

"MULTIPOLYGON(((30 0,29.4235584120969 -5.85270966048384,27.7163859753386 -11.4805029709527,24.9440883690764 -16.6671069905881,21.2132034355964 -21.2132034355964,16.6671069905881 -24.9440883690763,11.4805029709527 -27.7163859753386,5.85270966048389 -29.4235584120969,4.84662765649901e-014 -30,-5.85270966048379 -29.4235584120969,-11.4805029709526 -27.7163859753386,-16.667106990588 -24.9440883690764,-21.2132034355964 -21.2132034355965,-24.9440883690763 -16.6671069905881,-27.7163859753386 -11.4805029709528,-29.4235584120969 -5.85270966048394,-30 -9.69325531299803e-014,-29.4235584120969 5.85270966048375,-27.7163859753386 11.4805029709526,-24.9440883690764 16.667106990588,-21.2132034355965 21.2132034355963,-16.6671069905882 24.9440883690763,-11.4805029709528 27.7163859753386,-5.85270966048396 29.4235584120969,-1.12092138956216e-013 30,5.85270966048374 29.4235584120969,11.4805029709526 27.7163859753386,16.667106990588 24.9440883690764,21.2132034355964 21.2132034355965,24.9440883690763 16.6671069905881,27.7163859753386 11.4805029709528,29.4235584120969 5.85270966048391,30 0),(-10 -10,10 -10,10 10,-10 10,-10 -10)),((-65 -65,-65 -45,-45 -45,-45 -65,-65 -65)))";

现在这之后我的php做了转换，这是数组（将给定的系统数据表转换为数组）

$arr = pg_fetch_array($res);

现在我想写一些php做的类似功能？但无法正确转换

我的功能看起来像这样

public Array FetchArray(DataTable Dt)
    {
        int[] array;
        Array arr = new Array[];
        Array converted = new Array(Dt.Rows.Count);
        foreach (DataRow row in Dt.Rows)
        {
            arr.Add(row);//here it should convert the system DataTable into sytem array
        }
        return arr;

    }

有人请帮帮我。在此先感谢。

Answer 1

System.Data.DataRow类具有ItemArray属性，该属性返回数组中的行值（类型为object）

因此，以下示例可能会帮助您实现目标：

foreach (DataRow row in Dt.Rows)
{
    object[] values = row.ItemArray;
}

将datatable / dataset转换为给定数组

1 个答案: