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使用Marshal.Copy把Txt行数据转为Struct类型值
添加重要的命名空间:
using System.Runtime.InteropServices;
先建立结构相同(char长度相同)的Struct类型用于转换:
[StructLayout(LayoutKind.Sequential, Pack = 1)] public struct Employee { [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)] public char[] EmployeeId; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 30)] public char[] LastName; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 30)] public char[] FirstName; //这里省略很多列 }
数据文本类似下面, 如这三列固定长度(6,30,30):
10001 Nick Yang 10002 Nick2 Yang 10003 Nick3 Yang
代码获取并转换:
/// <summary> /// Get data from interface file /// </summary> public void GetDataFromFile() { try { string path = ConfigurationManager.ConnectionStrings["DataPath"].ConnectionString; if (File.Exists(path)) { string[] rows = File.ReadAllLines(path, Encoding.UTF8); foreach (string row in rows) { byte[] bytes = Encoding.UTF8.GetBytes(row); //以下为重点代码 int size = Marshal.SizeOf(typeof(Employee)); IntPtr buffer = Marshal.AllocHGlobal(size); try { Marshal.Copy(bytes, 0, buffer, size); //此处已经完成转换 Employee emp = (Employee)Marshal.PtrToStructure(buffer, typeof(Employee)); //省略很多代码 } catch (Exception ex) { throw new Exception("Error when Copying bytes from interface to Employee", ex); } finally { Marshal.FreeHGlobal(buffer); } } } else { throw new Exception(string.Format("Error. Can`t not find the interface file at ‘{0}‘", path)); } } catch (Exception ex) { throw new Exception("Error when getting data from interface file.", ex); } }
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