[英]TargetInvocationException was unhandled by user code
我被卡住了! 我有這個代碼
System.Data.Entity.Spatial.DbGeography pointLefttop = h.GreenPoly == null || h.GreenPoly.PointCount < 4 ? null : h.GreenPoly.PointAt(1);
System.Data.Entity.Spatial.DbGeography pointRighttop = h.GreenPoly == null || h.GreenPoly.PointCount < 4 ? null : h.GreenPoly.PointAt(2);
DbGeography linestringBack = pointLefttop == null || pointRighttop == null ? DbGeography.LineFromText("LINESTRING(0 0, 0 0)", 4326) : System.Data.Entity.Spatial.DbGeography.LineFromText("LINESTRING(" + pointLefttop.Longitude + " " + pointLefttop.Latitude + ", " + pointRighttop.Longitude + " " + pointRighttop.Latitude + ")", 4326);
其中h.GreenPoly
值是{SRID=4326;POLYGON ((-112.51643746 33.49170131, -112.51694319 33.4917729, -112.51685776 33.49219669, -112.51635201 33.49212509, -112.51643746 33.49170131))}
,其類型是System.Data.Entity.Spatial.DbGeography
但是我計算linestringBack
的行拋出異常
An exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.dll but was not handled in user code
Additional information: Exception has been thrown by the target of an invocation.
我嘗試用替換
DbGeography linestringBack = pointLefttop == null || pointRighttop == null ? DbGeography.LineFromText("LINESTRING(0.0, 0.0)", DbGeography.DefaultCoordinateSystemId) : System.Data.Entity.Spatial.DbGeography.LineFromText(
string.Format("LINESTRING({0} {1}, {2} {3})",
pointLefttop.Longitude.Value.ToString(CultureInfo.InvariantCulture), pointLefttop.Latitude.Value.ToString(CultureInfo.InvariantCulture), pointRighttop.Longitude.Value.ToString(CultureInfo.InvariantCulture), pointRighttop.Latitude.Value.ToString(CultureInfo.InvariantCulture))
, DbGeography.DefaultCoordinateSystemId);
但我仍然遇到相同的錯誤,無法找出原因。 有任何想法嗎?
編輯:
我找到了解決我問題的方法。 看來這與Microsoft.SqlServer.Types有關。 我使用的是版本11,並將其更新為14后可以正常工作(在VS2015和VS2017中測試)
對於那些可能會有相同問題的人:
右鍵單擊您的項目->管理NuGet軟件包...
在搜索選項卡(已安裝區域)中,鍵入Microsoft.SqlServer.Types
單擊它並更新到版本14
搜索到處都使用Microsoft.SqlServer.Types
類的Web.config
文件,並將newVersion
更改為14.0.0.0
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.