获取要素集中字段的唯一值

/// <summary>
/// 获取要素集中字段的唯一值
/// </summary>
/// <param name="featureClass">图层</param>
/// <param name="fieldName">字段名称</param>
/// <returns></returns>
public static List<double> GetUniquFieldValue(IFeatureClass featureClass, string fieldName)
{
List<double> pList = new List<double>();
IFeatureCursor pFeatureCursor = featureClass.Search(null, false);
IDataStatistics pData = new DataStatisticsClass();
pData.Field = fieldName;
pData.Cursor = pFeatureCursor as ICursor;
IEnumerator pEnumerator = pData.UniqueValues;
pEnumerator.Reset();
while (pEnumerator.MoveNext())
{
string pFieldValue = pEnumerator.Current.ToString();
double a;
Double.TryParse(pFieldValue, out a);
pList.Add(a);
}

ReleaseFeatureCursor(pFeatureCursor);
return pList;
}

/// <summary>
/// 释放FeatureCursor
/// </summary>
/// <param name="featureCursor">需要释放的游标</param>
public static void ReleaseFeatureCursor(IFeatureCursor featureCursor)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(featureCursor);
}

转载于:https://www.cnblogs.com/lzh5d/p/6957646.html

总结

以上是生活随笔为你收集整理的获取要素集中字段的唯一值的全部内容，希望文章能够帮你解决所遇到的问题。

如果觉得生活随笔网站内容还不错，欢迎将生活随笔推荐给好友。