我正在 VS2012 C# 中创建一个 ESRI ArcMap 10.2 扩展。我一直遇到一个问题，当我创建一个包含大量列的 shapefile 时，我得到了错误：
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
在功能工作区上实际运行 Create Feature 方法时。这是代码摘录：
public bool LoadData(DataQueryResult QueryResult, string ColumnX, string ColumnY)
{
bool loaded = true;
DataTable Data = QueryResult.ResultsTable;
try
{
using (ESRI.ArcGIS.ADF.ComReleaser ComReleaser = new ESRI.ArcGIS.ADF.ComReleaser())
{
//Create the field collection for editing
IFields Fields = new FieldsClass();
ComReleaser.ManageLifetime(Fields);
IFieldsEdit FieldsEdit = (IFieldsEdit)Fields;
//Create the geometry field
IGeometryDef GeomDef = new GeometryDef();
IGeometryDefEdit GeomDefEdit = (IGeometryDefEdit)GeomDef;
GeomDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint;
IField GeomField = new FieldClass();
IFieldEdit GeomFieldEdit = (IFieldEdit)GeomField;
GeomFieldEdit.Name_2 = ShapeFieldName;
GeomFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;
GeomFieldEdit.GeometryDef_2 = GeomDef;
GeomDefEdit.SpatialReference_2 = new UnknownCoordinateSystemClass();;
FieldsEdit.AddField(GeomField);
//Create the OID filed
IField OidField = new FieldClass();
IFieldEdit OidFieldEdit = (IFieldEdit)OidField;
OidFieldEdit.Name_2 = "OID";
OidFieldEdit.Type_2 = esriFieldType.esriFieldTypeOID;
FieldsEdit.AddField(OidField);
//Add a field for each column
foreach (DataColumn col in Data.Columns)
{
IField2 field = new FieldClass();
IFieldEdit fieldedit = (IFieldEdit)field;
fieldedit.Name_2 = col.ColumnName;
bool AddField = false;
if (col.DataType.IsIn(typeof(Int64), typeof(Int32)))
{
//Best we can do is 32 bit in a shapefile
fieldedit.Type_2 = esriFieldType.esriFieldTypeInteger;
AddField = true;
}
else if (col.DataType == typeof(Int16))
{
fieldedit.Type_2 = esriFieldType.esriFieldTypeSmallInteger;
AddField = true;
}
else if (col.DataType == typeof(Single))
{
fieldedit.Type_2 = esriFieldType.esriFieldTypeSingle;
AddField = true;
}
else if (col.DataType == typeof(double))
{
fieldedit.Type_2 = esriFieldType.esriFieldTypeDouble;
AddField = true;
}
else if (col.DataType == typeof(string))
{
fieldedit.Type_2 = esriFieldType.esriFieldTypeString;
//Here is where I get "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
//The higher the number of fields the fewer "runs" of this method needed to hit the error.
//At 150 it is hit right away but if it is at, say, 50 it can run many times.
if (Fields.FieldCount < 150)
AddField = true;
else
System.Diagnostics.Debug.Write(field.Name + "; ");
}
else if (col.DataType == typeof(DateTime))
{
fieldedit.Type_2 = esriFieldType.esriFieldTypeDate;
AddField = true;
}
else if (col.DataType == typeof(bool))
{
fieldedit.Type_2 = esriFieldType.esriFieldTypeString;
AddField = true;
}
if (AddField)
FieldsEdit.AddField(field);
}
//FilePath is the ArcMap temp folder generated for the session so something like "C:\Users\USERNAME\AppData\Local\Temp\arc1097\\"
IWorkspaceFactory WorkspaceFactory = new ShapefileWorkspaceFactoryClass();
IFeatureWorkspace FeatureWorkspace = (IFeatureWorkspace)WorkspaceFactory.OpenFromFile(FilePath, hWnd);
ComReleaser.ManageLifetime(WorkspaceFactory);
//FileName is a class memeber which might be something like "o2zkdrnv.shp" which is randomly generated
FeatureClass = FeatureWorkspace.CreateFeatureClass(FileName, Fields, null, null, esriFeatureType.esriFTSimple, ShapeFieldName, ""); //<-- THE ERROR OCCURS HERE
ComReleaser.ManageLifetime(FeatureClass);
}
}
}
所以我只能假设这是某种内存错误。我允许的列越多（带有“< 150”的行），在遇到错误之前我可以重复运行的次数越多。似乎 65 左右是我立即开始看到它的阈值。在此之下，我可以在击中它之前运行它，比如说，5-6 次，但这似乎非常不一致。如果我停止调试 VS 并重新启动项目，它似乎会更快发生。我添加了 ComReleaser 认为它可能会有所帮助（甚至认为它在技术上不是 ArcMap 命名空间的一部分），但它没有任何区别。
正在传递的数据表包含以下字段列表：
RecordID,SiteID,SiteName,SiteType,LocID,LocName,LocType,LocX,LocY,LocZ,LocLong,LocLat,LocTop,LocBot,LocGroup,SampID,SampName,SampDate,SampDate2,SampTime,SampTime2,SampType,SampGroup,SampMatrix,SampTop,cSampTop,SampBot,cSampBot,SampElev,cSampElev,SampUnit,AnalyteID,Analyte,Result,cResult,Flag,Unit,DetectLim,cDetectLim,IsDetect,IsTIC,IsReject,Method,Category,LabID,Comment,Source,RegName01,RegValue01,RegAbove01,RegName02,RegValue02,RegAbove02,RegName03,RegValue03,RegAbove03,RegName04,RegValue04,RegAbove04,RegName05,RegValue05,RegAbove05,RegName06,RegValue06,RegAbove06,RegName07,RegValue07,RegAbove07,RegName08,RegValue08,RegAbove08,RegName09,RegValue09,RegAbove09,RegName10,RegValue10,RegAbove10,RegName11,RegValue11,RegAbove11,RegName12,RegValue12,RegAbove12,RegName13,RegValue13,RegAbove13,RegName14,RegValue14,RegAbove14,RegName15,RegValue15,RegAbove15,RegName16,RegValue16,RegAbove16,RegName17,RegValue17,RegAbove17,RegName18,RegValue18,RegAbove18,RegName19,RegValue19,RegAbove19,RegName20,RegValue20,RegAbove20,RegName21,RegValue21,RegAbove21,RegName22,RegValue22,RegAbove22,RegName23,RegValue23,RegAbove23,RegName24,RegValue24,RegAbove24,RegName25,RegValue25,RegAbove25,RegName26,RegValue26,RegAbove26,RegName27,RegValue27,RegAbove27,RegName28,RegValue28,RegAbove28,RegName29,RegValue29,RegAbove29,RegName30,RegValue30,RegAbove30
从理论上讲，表格的内容应该无关紧要，因为此方法从中提取的唯一内容是 Columns 集合。
任何帮助都感激不尽。