[英]Convert List<T> to List<myType>
调用任何Convert函数错误时:
Argument 2: cannot convert from 'System.Collections.Generic.List<T>' to 'System.Collections.Generic.List<ProductionRecent>
我试图传递函数内部的任何列表,确定它必须是哪个列表并进行转换。 有什么建议么?
public List<T> ConvertToList<T>(DataTable dt, List<T> list)
{
if (list.GetType() == typeof(List<ProductionPending>))
{
ConvertToProductionPending(dt, list); // ERROR
}
else if (list.GetType() == typeof(List<ProductionRecent>))
{
ConvertToProductionRecent(dt, list); // ERROR
}
else if (list.GetType() == typeof(List<MirrorDeployments>))
{
ConvertToMirror(dt list); // ERROR
}
return list;
}
private List<ProductionPending> ConvertToProductionPending(DataTable dt, List<ProductionPending> list)
{
// do some stuff here
return list;
}
private List<ProductionRecent> ConvertToProductionRecent(DataTable dt, List<ProductionRecent> list)
{
// do some stuff here
return list;
}
private List<MirrorDeployments> ConvertToMirror(DataTable dt, List<MirrorDeployments> list)
{
// do some stuff here
return list;
}
尝试在传递给您的方法之前进行投射:
public List<T> ConvertToList<T>(DataTable dt, List<T> list)
{
if (list.GetType() == typeof(List<ProductionPending>))
{
ConvertToProductionPending(dt, (list as List<ProductionPending>));
}
else if (list.GetType() == typeof(List<ProductionRecent>))
{
ConvertToProductionRecent(dt, (list as List<ProductionRecent>));
}
else if (list.GetType() == typeof(List<MirrorDeployments>))
{
ConvertToMirror(dt, (list as List<MirrorDeployments>));
}
return list;
}
编辑:
另外,如果您只是不做任何事情就返回列表,则根本不需要convert方法,只需像List<MirrorDeployments> l2 = (list as List<MirrorDeployments>)
如果您使用的是C#7,则还可以使用模式匹配 :
public List<T> ConvertToList<T>(DataTable dt, List<T> list)
{
switch(list)
{
case List<ProductionPending> pp:
//pp is list cast as List<ProductionPending>
break;
case List<ProductionRecent> pr:
//pr is list cast as List<ProductionRecent>
break;
case List<MirrorDeployments> md:
//md is list cast as List<MirrorDeployments>
break;
}
return list;
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.