/// <summary>
/// 根据数据类型，进行类型转换获取数据值
/// </summary>
/// <param name="fieldInfo">字段信息</param>
/// <param name="text">从dbf表中获取得字符串值</param>
/// <param name="buffer"></param>
/// <returns></returns>
private object GetValueObj(DbfFieldInfo fieldInfo, string text, byte[] buffer)
{
object obj;
switch ((DbfFieldType)fieldInfo.FieldType)
{
case DbfFieldType.Character:
obj = text;
break;
case DbfFieldType.Numeric:
if (String.IsNullOrWhiteSpace(text))
{
obj = 0.0;
}
else
{
obj = Convert.ToDouble(text);
}
break;
case DbfFieldType.Date:
if (String.IsNullOrWhiteSpace(text))
{
obj = null;
}
else
{
obj = DateTime.ParseExact(text, "yyyyMMdd", CultureInfo.InvariantCulture);
}
break;
case DbfFieldType.Logical:
if (String.IsNullOrWhiteSpace(text))
{
obj = false;
}
else
{
obj = (buffer[0] == 'Y' || buffer[0] == 'T');
}
break;
case DbfFieldType.General:
case DbfFieldType.Byte:
default:
obj = buffer;
break;
}
return(obj);
}
public static Type DbfFieldType2CSharpType(DbfFieldInfo dbfFieldInfo)
{
Type cSharpType;
switch (dbfFieldInfo.FieldType)
{
case DbfFieldType.Character:
cSharpType = typeof(string);
break;
case DbfFieldType.Numeric:
if (dbfFieldInfo.Accuracy == 0)
{
if (dbfFieldInfo.FieldLength == 4)
{
cSharpType = typeof(int);
}
else if (dbfFieldInfo.FieldLength <= 8)
{
cSharpType = typeof(long);
}
else
{
cSharpType = typeof(double);
}
}
else
{
cSharpType = dbfFieldInfo.Accuracy > 6 ? typeof(double) : typeof(float);
}
break;
case DbfFieldType.Date:
cSharpType = typeof(DateTime);
break;
case DbfFieldType.Logical:
cSharpType = typeof(bool);
break;
case DbfFieldType.General:
case DbfFieldType.Byte:
default:
cSharpType = typeof(byte[]);
break;
}
return(cSharpType);
}
/// <summary>
/// 从头中解析出字段名及字段类型
/// </summary>
/// <param name="tableHeader"></param>
private void GetFieldsFromHeader(byte[] tableHeader)
{
if (tableHeader.Length >= this.HeaderLength)
{
for (int i = 1; i <= this.FieldCount; i++)
{
var offset = i * 32;
var fieldInfo = new DbfFieldInfo
{
FieldName = Encoding
.GetString(tableHeader, offset, 10)
.Replace("\0", ""),
FieldType = (DbfFieldType)
(Encoding
.GetChars(tableHeader, offset + 11, 1)[0]),
FieldLength = tableHeader[offset + 16],
Accuracy = tableHeader[offset + 17]
};
FieldInfos.Add(fieldInfo);
}
}
}
