C# 数据库地理位置类型MakeValid似乎不起作用

我有一个应用程序，用户可以在其中绘制分区，然后检查多段线是否与分区相交

应用程序突然崩溃，出现以下错误：

A .NET Framework error occurred during execution of user-defined routine or aggregate "geography": 
System.ArgumentException: 24144: This operation cannot be completed because the instance is not valid. Use MakeValid to convert the instance to a valid instance. Note that MakeValid may cause the points of a geometry instance to shift slightly.
System.ArgumentException: 
  at Microsoft.SqlServer.Types.SqlGeography.STIntersects(SqlGeography other)

我对消息“Use MakeValid”感到惊讶，因为我正在使用“MakeValid”，如下所示：

Select ZonePolygonId, ZoneName, isHome  FROM dbo.SpatialZonePolygons 
WHERE Coordinates.STIntersects(geography::STGeomFromText('LINESTRING(51.15826 -0.18398, 51.15855 -0.18404, 51.15883 -0.18414, 51.15903 -0.18427, 51.15915 -0.18437, 51.15922 -0.1845, 51.15918 -0.18493, 51.15882 -0.18748, 51.15975 -0.18783, 51.15994 -0.18793, 51.16056 -0.18846, 51.16055 -0.1885, 51.16054 -0.1886, 51.16057 -0.18877, 51.16061 -0.18884, 51.16067 -0.18888, 51.16072 -0.18889, 51.16078 -0.18888, 51.16086 -0.18878, 51.1609 -0.18861, 51.16087 -0.18843, 51.16085 -0.1884, 51.16175 -0.18677, 51.16203 -0.18625, 51.16227 -0.18587, 51.16246 -0.18566, 51.16263 -0.18552, 51.16319 -0.18513, 51.16333 -0.18502, 51.16351 -0.18481, 51.16362 -0.18462, 51.16371 -0.18437, 51.1638 -0.18386, 51.1643 -0.18029, 51.16466 -0.17755, 51.16466 -0.17715, 51.16458 -0.17674, 51.16441 -0.17635, 51.16414 -0.17593, 51.16386 -0.17558, 51.16367 -0.17538, 51.16369 -0.17534, 51.16372 -0.17524, 51.16371 -0.17514, 51.16369 -0.17505, 51.16365 -0.17498, 51.16359 -0.17494, 51.16354 -0.17493, 51.16351 -0.17494, 51.16348 -0.17482, 51.16346 -0.17473, 51.16341 -0.17459, 51.16278 -0.17353, 51.16262 -0.17324, 51.16255 -0.17308, 51.16254 -0.17298, 51.16256 -0.17275, 51.16282 -0.17248, 51.16305 -0.1723, 51.16321 -0.17222, 51.16334 -0.17219, 51.16347 -0.17219, 51.16367 -0.17225, 51.16385 -0.17237, 51.16403 -0.17256, 51.16427 -0.17292, 51.16459 -0.17345, 51.16476 -0.17363, 51.16665 -0.17706, 51.16728 -0.17817, 51.16728 -0.17823, 51.1673 -0.17835, 51.16734 -0.17842, 51.16741 -0.17851, 51.16747 -0.17854, 51.16756 -0.17853, 51.16765 -0.17845, 51.16771 -0.17831, 51.16772 -0.17815, 51.16771 -0.17807, 51.16776 -0.17743, 51.16798 -0.1769, 51.16831 -0.17611, 51.16848 -0.17578, 51.16881 -0.17529, 51.16925 -0.17463, 51.16976 -0.17384, 51.17095 -0.17214, 51.171 -0.17225, 51.17097 -0.17278, 51.17131 -0.1729, 51.17149 -0.17297, 51.17161 -0.17296, 51.1719 -0.17276, 51.172 -0.17265, 51.17208 -0.17246, 51.1722 -0.17178, 51.17225 -0.17151, 51.17229 -0.17143, 51.17241 -0.17132, 51.17272 -0.17129, 51.17297 -0.17124, 51.17332 -0.17118, 51.17341 -0.17118, 51.17347 -0.17124, 51.17352 -0.17136, 51.17368 -0.17199', 4326).MakeValid())>0

后来，我发现有问题的多边形（见图）绘制得非常糟糕，我想这就是问题的原因

INSERT INTO SpatialZonePolygons (ZoneName,Coordinates) VALUES ('ValidZone',geography::STGeomFromText('POLYGON([SqlFormattedCoordinates here])', 4326).MakeValid())

因此，我的具体问题是：

我是否正确使用MakeValid？我以为MakeValid（）可以解决这种问题

很明显，我无法控制我的客户的绘图技能，所以如果MakeValid对绘制糟糕的多边形没有帮助，是否有其他方法可以帮助我。。。这是有效的吗

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非常感谢。

好的，所以问题确实是数据库中保存的多边形区域无效

错误消息中的“Use MakeValid”触发了一些错误的假设，因为我已经在使用MakeValid了。实际上，此错误是由无效的多边形区域触发的，而不是我在查询中使用的多段线

为了防止出现这种情况，我在INSERT SQL语句中添加了“MakeValid（）”，以便数据库中不再存在无效多边形

我已经测试过在INSERT语句中插入一个无效的多边形，该多边形有“MakeValid”和没有“MakeValid”，并且可以确认添加“MakeValid”确实解决了这个问题

INSERT INTO SpatialZonePolygons (ZoneName,Coordinates) VALUES ('ValidZone',geography::STGeomFromText('POLYGON([SqlFormattedCoordinates here])', 4326).MakeValid())

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它应该是

geometry:：stgeomefromtext

而不是

geography:：stgeomefromtext

？另外，

LINESTRING

值似乎缺少一个右括号。谢谢@adrift。是的，括号就是问题所在。似乎代码中有创建查询的内容。关于这个多边形。。。某种截断正在发生，迫使最后一个括号被截断。这就解释了为什么其他地区没有受到影响。看来我现在正在进行另一次搜索。好吧，我想问题是盗贼多边形已以无效状态保存到数据库中。此查询中的MakeValid不会更改它正在查询无效区域的事实。我已经推断出，我必须先确保区域处于有效状态，然后才能在insert上使用MakeValid将其插入数据库。