C#代码中如何比较两个日期的大小？

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C#中比较两个日期大小的方法

/// <summary>
/// 比较两个日期大小
/// </summary>
/// <param name="dateStr1">日期1</param>
/// <param name="dateStr2">日期2</param>
/// <param name="msg">返回信息</param>
public void CompanyDate(string dateStr1, string dateStr2,ref string msg) {
//将日期字符串转换为日期对象
DateTime t1 = Convert.ToDateTime(dateStr1);
DateTime t2 = Convert.ToDateTime(dateStr2);
//通过DateTIme.Compare()进行比较（）
int compNum = DateTime.Compare(t1, t2); //t1> t2
if (compNum > ) {
msg = "t1:(" + dateStr1 + ")大于" + "t2(" + dateStr2 + ")";
}
//t1= t2
if (compNum == ) {
msg = "t1:(" + dateStr1 + ")等于" + "t2(" + dateStr2 + ")";
}
//t1< t2
if (compNum < ) {
msg = "t1:(" + dateStr1 + ")小于" + "t2(" + dateStr2 + ")";
}
}

调用的代码

public ActionResult Index()
{
//t1< t2
string msg1 = string.Empty;
string date1 = "2018-07-25";
string date2 = "2018-07-27";
CompanyDate(date1,date2,ref msg1); //t1> t2
string msg2 = string.Empty;
string date3 = "2018-07-27";
string date4 = "2018-07-25";
CompanyDate(date3, date4, ref msg2); return View();
}

整体demo源码

public class TestController : Controller
{
// GET: Test
public ActionResult Index()
{
//t1< t2
string msg1 = string.Empty;
string date1 = "2018-07-25";
string date2 = "2018-07-27";
CompanyDate(date1,date2,ref msg1); //t1> t2
string msg2 = string.Empty;
string date3 = "2018-07-27";
string date4 = "2018-07-25";
CompanyDate(date3, date4, ref msg2); return View();
} /// <summary>
/// 比较两个日期大小
/// </summary>
/// <param name="dateStr1">日期1</param>
/// <param name="dateStr2">日期2</param>
/// <param name="msg">返回信息</param>
public void CompanyDate(string dateStr1, string dateStr2,ref string msg) {
//将日期字符串转换为日期对象
DateTime t1 = Convert.ToDateTime(dateStr1);
DateTime t2 = Convert.ToDateTime(dateStr2);
//通过DateTIme.Compare()进行比较（）
int compNum = DateTime.Compare(t1, t2); //t1> t2
if (compNum > ) {
msg = "t1:(" + dateStr1 + ")大于" + "t2(" + dateStr2 + ")";
}
//t1= t2
if (compNum == ) {
msg = "t1:(" + dateStr1 + ")等于" + "t2(" + dateStr2 + ")";
}
//t1< t2
if (compNum < ) {
msg = "t1:(" + dateStr1 + ")小于" + "t2(" + dateStr2 + ")";
}
}
}