C# 实体框架:将varchar映射到DateTime属性
实体框架4。MySQL 我试图将varchar列映射到类的DateTime属性 我的班级:C# 实体框架:将varchar映射到DateTime属性,c#,.net,mysql,entity-framework,orm,C#,.net,Mysql,Entity Framework,Orm,实体框架4。MySQL 我试图将varchar列映射到类的DateTime属性 我的班级: [Table("webnews_in")] public class WEBNews_in : AbsNews { private DateTime _inDateTimeAdded = DateTime.MinValue; public DateTime InDateTimeAdded { get { return _inDateTimeAdded; }
[Table("webnews_in")]
public class WEBNews_in : AbsNews
{
private DateTime _inDateTimeAdded = DateTime.MinValue;
public DateTime InDateTimeAdded
{
get { return _inDateTimeAdded; }
set { _inDateTimeAdded = value; }
}
private DateTime _inDateTimeUpdated = DateTime.MinValue;
public DateTime InDateTimeUpdated
{
get { return _inDateTimeUpdated; }
set { _inDateTimeUpdated = value; }
}
}
我得到了这个错误:
Input string was not in a correct format.
Message Input string was not in a correct format.
Data IDictionary (0 items)
StackTrace at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
at MySql.Data.Types.MySqlDateTime.ParseMySql(String s)
at MySql.Data.MySqlClient.MySqlDataReader.GetDateTime(Int32 i)
at MySql.Data.Entity.EFMySqlDataReader.GetDateTime(Int32 ordinal)
HelpLink null
Source mscorlib
每次在模型中设置与表不同的类型时,EF都会抛出错误,即,如果在模型中将字段设置为整数,但该字段在表中具有字符串类型,则在加载数据时,它将给您一个错误。为了避免这种情况,您必须采取变通办法,声明一个表类型等效的公共属性,并将其转换为所需的模型类型,请尝试以下操作:
[Table("webnews_in")]
public class WEBNews_in : AbsNews {
private DateTime _inDateTimeAdded = DateTime.MinValue;
public string InDateTimeAdded {
get {
return Format(_inDateTimeAdded, " dd/MM/yyyy hh:mm:ss tt");
}
set {
_inDateTimeAdded = DateTime.Parse(value);
}
}
private DateTime _inDateTimeUpdated = DateTime.MinValue;
public string InDateTimeUpdated {
get {
return Format(_inDateTimeUpdated, " dd/MM/yyyy hh:mm:ss tt");
}
set {
_inDateTimeUpdated = DateTime.Parse(value);
}
}
}
您能解释一下为什么需要
varchar
作为date
字段吗?你知道,这是历史遗留下来的问题,而不是datetime
@JamesKhoury。一切都是varchar或integer如果数据有效,我个人会尝试更改数据库。将来可能不会让您头痛。但是属性“InDateTimeAdded”仍然是字符串,并且我仍然无法使用DateTime类型属性??
[Table("webnews_in")]
public class WEBNews_in : AbsNews {
private DateTime _inDateTimeAdded = DateTime.MinValue;
public string InDateTimeAdded {
get {
return Format(_inDateTimeAdded, " dd/MM/yyyy hh:mm:ss tt");
}
set {
_inDateTimeAdded = DateTime.Parse(value);
}
}
private DateTime _inDateTimeUpdated = DateTime.MinValue;
public string InDateTimeUpdated {
get {
return Format(_inDateTimeUpdated, " dd/MM/yyyy hh:mm:ss tt");
}
set {
_inDateTimeUpdated = DateTime.Parse(value);
}
}
}