我在sql中保存DateTime时遇到问题。我的问题是我想保存具有空值的DateTime。任何人都可以帮我解决这个问题吗？
这是我的代码：
HTML：
<div class="infoHeader">
Worker Skill</div>
<div class="main">
@using (Html.BeginForm("SkillsTestSave", "Worker", FormMethod.Post, new { id = "skillForm" }))
{
<input type="hidden" id="skillId" name="skillId" value="@workerId" />
<p>
<label for="skillName">
<abbr title="This is a required field.">
<em><font color="red">*</font></em></abbr>
Skill Name</label>
<span>
<input type="text" id="txtSkillName" name="txtSkillName" class="validate[required,maxSize[50]] inputLong" value="@workerSkillName" />
</span>
</p>
<p>
<label for="skillLevel">
<abbr title="This is a required field.">
<em><font color="red">*</font></em></abbr>
Skill Level</label>
<span>
<input type="hidden" id="txtSkillLevel" name="txtSkillLevel" class="validate[required] inputLong"
value="@workerSkillLevel" />
<input type="radio" id="radiolvl1" name="radiolvl" class="radiolvl" value="1" />
<input type="radio" id="radiolvl2" name="radiolvl" class="radiolvl" value="2" />
<input type="radio" id="radiolvl3" name="radiolvl" class="radiolvl" value="3" />
<input type="radio" id="radiolvl4" name="radiolvl" class="radiolvl" value="4" />
<input type="radio" id="radiolvl5" name="radiolvl" class="radiolvl" value="5" />
</span>
@*<span>
<input type="text" id="txtSkillLevel" name="txtSkillLevel" class="validate[required,maxSize[100]] inputLong" value="@workerSkillLevel" />
</span>*@
</p>
<p>
<label for="skilldescription">
Skill Description</label>
<span>
<textarea style="overflow: auto; resize: none" rows="3" cols="27" id="txtSkillDescription"
name="txtSkillDescription">@workerSkillDescription</textarea>
</span>
</p>
<p>
<label for="skillCertificate">
@* <abbr title="This is a required field.">
<em><font color="red">*</font></em></abbr>*@
Certificate</label>
<span>
<input type="text" id="txtSkillCertificate" name="txtSkillCertificate" @*class="validate[required,maxSize[200]] inputLong"*@ value="@workerCertificate" />
</span>
</p>
<p>
<label for="skillDateAcquired">
@* <abbr title="This is a required field.">
<em><font color="red">*</font></em></abbr>*@
Date Acquired</label>
<span>
<input id="skillDateAcquired" name ="skillDateAcquired" value = "@workerDateAcquired" style="padding: 0 0 0 0 !important"/>
</span>
</p>
<script type="text/javascript">
$(document).ready(function () {
$("#skillDateAcquired").kendoDatePicker({
max: new Date(2050, 0, 12)
});
$("#skillDateAcquired").attr("readonly", "readonly");
// $("#skillDateAcquired").attr("class", "validate[required]");
$("#skillDateAcquired").attr("aria-disabled", "true");
});
</script>
<p>
<span>
<input type="submit" id="skillBtn" class="styledButton" value="Add" />
</span>
</p>
}
</div>
我的保存控制器：
[Authorize]
[HttpPost]
public ActionResult SkillsTestSave(FormCollection formCollection)
{
String msg = String.Empty;
String workerId = formCollection["SkillId"];
String workerSkillId = formCollection["workerSkillId"];
String workerSkillName = formCollection["txtSkillName"];
String workerSkillLevel = formCollection["txtSkillLevel"];
String workerSkillDescription = formCollection["txtSkillDescription"];
String workerCertificate = formCollection["txtSkillCertificate"];
String workerDateAcquired = formCollection["skillDateAcquired"];
Worker_Skills skill = new Worker_Skills();
try
{
if (String.IsNullOrWhiteSpace(workerSkillId) || workerSkillId == "0")
{
skill.Worker_ID = Convert.ToInt32(workerId);
skill.SkillName = workerSkillName.Trim();
skill.SkillLevel = workerSkillLevel.Trim();
skill.SkillDescription = workerSkillDescription.Trim();
skill.Certificate = workerCertificate.Trim();
skill.DateAcquired = Convert.ToDateTime(workerDateAcquired);
skill.DateCreated = DateTime.UtcNow;
skill.DateModified = DateTime.UtcNow;
skill.CreatedBy = User.Identity.Name;
skill.ModifiedBy = User.Identity.Name;
db.Worker_Skills.Add(skill);
}
}
catch (Exception)
{
msg = "Failed to save";
}
db.SaveChanges();
if (String.IsNullOrWhiteSpace((msg)))
{ TempData["message"] = "Saved Successfully."; }
else if (msg != "")
{ TempData["message"] = msg; }
if (Roles.IsUserInRole("Worker"))
{
var url = UrlHelper.GenerateUrl(
null,
"WorkerIndex",
"Worker",
null,
null,
"anchorSkills",
new RouteValueDictionary(new { workerId = workerId }),
Url.RouteCollection,
Url.RequestContext,
false
);
return Redirect(url);
}
else
{
var url = UrlHelper.GenerateUrl(
null,
"workerDetails",
"Worker",
null,
null,
"anchorSkills",
new RouteValueDictionary(new { workerId = workerId }),
Url.RouteCollection,
Url.RequestContext,
false
);
return Redirect(url);
}
}
我在表格中将dateacquired的值设置为可以为空的DateTime：
namespace SmartTimers.Models
{
using System;
using System.Collections.Generic;
public partial class Worker_Skills
{
public int ID { get; set; }
public int Worker_ID { get; set; }
public string SkillName { get; set; }
public bool LogicalDelete { get; set; }
public string SkillLevel { get; set; }
public string SkillDescription { get; set; }
public string Certificate { get; set; }
public Nullable<System.DateTime> DateAcquired { get; set; }
public System.DateTime DateCreated { get; set; }
public string CreatedBy { get; set; }
public System.DateTime DateModified { get; set; }
public string ModifiedBy { get; set; }
public virtual Worker Worker { get; set; }
}
}
另一个想法： 如果我不能将它设置为null，我怎样才能将它设置为DateTime？
答案 0 :(得分：2)
我不确定我是否完全理解这个问题，你说如果输入的值为null，你想将它保存为DateTime.Now，如果不是，你想将它保存为输入的内容？在那种情况下，
DateTime enteredDate;
DateTime.TryParse(workerDateAcquired, out enteredDate);
skill.DateAcquired = enteredDate.Equals(DateTime.MinValue) ? DateTime.Now : enteredDate;
这会尝试将输入的日期解析为有效的dateTime，如果不能，则inputDate将是最小的dateTime值。最后一行将DateAcquired设置为DateTime.Now如果无法解析enteredDate（您可以将其设置为您想要的任何内容），并且如果能够解析日期，则输入Date。