c# - 根据日期时间比较两个文件最多一分钟？

Question

我需要通过在比较时消除秒数来比较基于日期时间的两个文件直到分钟...

public class FileCompareLastwritetime : System.Collections.Generic.IEqualityComparer<System.IO.FileInfo>
        {
            public FileCompareLastwritetime() { }
            public bool Equals(System.IO.FileInfo f1, System.IO.FileInfo f2)
            {
                return f1.LastWriteTime == f2.LastWriteTime;
            }
            public int GetHashCode(System.IO.FileInfo fi)
            {
                string s = String.Format("{0}", fi.LastWriteTime);
                return s.GetHashCode();
            }
        }

Answer 1

怎么样:

public class FileCompareLastwritetime
        : System.Collections.Generic.IEqualityComparer<System.IO.FileInfo> {
    public FileCompareLastwritetime() { }
    public bool Equals(System.IO.FileInfo f1, System.IO.FileInfo f2) {
        return ToMinute(f1.LastWriteTime) == ToMinute(f2.LastWriteTime);
    }
    public int GetHashCode(System.IO.FileInfo fi) {
        return ToMinute(fi.LastWriteTime).GetHashCode();
    }
    static DateTime ToMinute(DateTime value) {
        return new DateTime(value.Year, value.Month, value.Day,
                 value.Hour, value.Minute, 0, value.Kind);
    }
}