前言
在.net core项目中需要读写dbf文件,可以使用FastDBF操作dbf文件,十分方便,使用Nuget可以添加FastDBF
代码实现
1 public class DBFUtil 2 { 3 private static List<KeyValuePair<string, PropertyInfo>> Mapping<T>() where T : class 4 { 5 Type type = typeof(T); 6 var properties = type.GetProperties(); 7 8 List<KeyValuePair<string, PropertyInfo>> result = new List<KeyValuePair<string, PropertyInfo>>(); ; 9 //保存dbf字段和实体的映射关系 10 //实体没有ColumnAttribute,则认为dbf字段名称和实体名称一致 11 foreach (var pro in properties) 12 { 13 var attrs = pro.GetCustomAttributes(typeof(ColumnAttribute), false); 14 if (attrs == null) 15 { 16 result.Add(new KeyValuePair<string, PropertyInfo>(pro.Name, pro)); 17 } 18 else 19 { 20 ColumnAttribute ar = (ColumnAttribute)attrs[0]; 21 if (ar == null) 22 { 23 result.Add(new KeyValuePair<string, PropertyInfo>(pro.Name, pro)); 24 25 } 26 else 27 { 28 result.Add(new KeyValuePair<string, PropertyInfo>(ar.Name, pro)); 29 } 30 } 31 } 32 return result; 33 } 34 35 36 /// <summary> 37 /// 导出dbf 38 /// </summary> 39 /// <typeparam name="T"></typeparam> 40 /// <param name="list">列表数据</param> 41 /// <param name="dbfPath">dbf保存路径</param> 42 /// <returns></returns> 43 public static string WritePdf<T>(List<T> list, string dbfPath) where T : class 44 { 45 if (list == null) 46 { 47 return null; 48 } 49 try 50 { 51 var dicProperty = Mapping<T>(); 52 //创建dbf文件 53 var odbf = new DbfFile(Encoding.Default); 54 odbf.Open(Path.Combine(dbfPath), FileMode.Create); 55 //create a header 56 foreach (var it in dicProperty) 57 { 58 odbf.Header.AddColumn(new DbfColumn(it.Key, DbfColumn.DbfColumnType.Character, 255, 0)); 59 } 60 61 foreach (var it in list) 62 { 63 var orec = new DbfRecord(odbf.Header) { AllowDecimalTruncate = true }; 64 foreach (var col in dicProperty) 65 { 66 var pro = col.Value; 67 object value = pro.GetValue(it); 68 if (value == null || value == DBNull.Value) 69 { 70 value = ""; 71 } 72 orec[col.Key] = value.ToString(); 73 } 74 odbf.Write(orec, true); 75 } 76 77 odbf.WriteHeader(); 78 79 odbf.Close(); 80 return dbfPath; 81 82 } 83 catch (Exception ex) 84 { 85 throw ex; 86 } 87 88 89 } 90 /// <summary> 91 /// 读取dbf文件 92 /// </summary> 93 /// <typeparam name="T"></typeparam> 94 /// <param name="dbfPath">dbf文件路径</param> 95 /// <returns></returns> 96 public static List<T> ReadPdf<T>(string dbfPath) where T : class 97 { 98 if (!File.Exists(dbfPath)) 99 { 100 return null; 101 } 102 List<T> list = new List<T>(); 103 104 try 105 { 106 var dicProperty = Mapping<T>(); 107 //获取一个DBF文件对象 108 DbfFile dbf = new DbfFile(Encoding.Default); 109 dbf.Open(dbfPath, FileMode.Open); 110 111 //读取dbf的字段名 112 DbfHeader dh = dbf.Header; 113 List<string> dbfColumns = new List<string>(); 114 for (int index = 0; index < dh.ColumnCount; index++) 115 { 116 dbfColumns.Add(dh[index].Name); 117 } 118 //读取数据 119 int i = 0; 120 while (dbf.Read(i) != null) 121 { 122 //读取一行 123 DbfRecord record = dbf.Read(i); 124 if (record == null) 125 { 126 continue; 127 } 128 T t = Activator.CreateInstance<T>(); 129 foreach (var col in dbfColumns) 130 { 131 var data = dicProperty.FirstOrDefault(r => r.Key == col); 132 if (data.Key == null) 133 { 134 continue; 135 } 136 var pro = data.Value; 137 if (pro == null || !pro.CanWrite) 138 { 139 continue; 140 } 141 string value = record[col]; 142 if (value == null) 143 { 144 continue; 145 } 146 pro.SetValue(t, Convert.ChangeType(value.Trim(), pro.PropertyType)); 147 } 148 list.Add(t); 149 i++; 150 } 151 dbf.Close(); 152 return list; 153 } 154 catch (Exception ex) 155 { 156 throw ex; 157 } 158 159 } 160 }
原文地址:https://www.cnblogs.com/kun2008/p/12019806.html
时间: 2024-10-10 23:03:27