类型“string”必须是不可以为 null 值的类型才能用作泛型类型或方法“System.Nullable”中的参数“T”
把string?改成string...string是引用类型，本来就可为null，可空泛型结构只允许用于值类型...基础...
动软代码：
private <#= CodeCommon.DbTypeToCS(c.TypeName) #><#if(c.Nullable && CodeCommon.DbTypeToCS(c.TypeName) !="string") {#>?<#}#> _<#= c.ColumnName.ToString().ToLower() #>;
c#代码：
private int _id;
private decimal? _n_MinMeasuringRange;
private string _vc_memo;
namespace DB_Mine.Model
{
/// <summary>
/// m_Sensor:实体类(属性说明自动提取数据库字段的描述信息)
/// </summary>
[Serializable]
public partial class m_Sensor
{
public m_Sensor()
{}
#region Model
private int _id;
private decimal? _n_MinMeasuringRange;
private string? _vc_memo;
public int ID
{
set{ _id=value;}
get{return _id;}
}
public decimal? n_MinMeasuringRange
{
set{ _n_minmeasuringrange=value;}
get{return _n_minmeasuringrange;}
}
public string? vc_Memo
{
set{ _vc_memo=value;}
get{return _vc_memo;}
}
#endregion Model
}
}
namespace DB_Mine.Model
{
/// <summary>
/// m_Sensor:实体类(属性说明自动提取数据库字段的描述信息)
/// </summary>
[Serializable]
public partial class m_Sensor
{
public m_Sensor()
{}
#region Model
private int _id;
private decimal? _n_MinMeasuringRange;
private string _vc_memo;
public int ID
{
set{ _id=value;}
get{return _id;}
}
public decimal? n_MinMeasuringRange
{
set{ _n_minmeasuringrange=value;}
get{return _n_minmeasuringrange;}
}
public string vc_Memo
{
set{ _vc_memo=value;}
get{return _vc_memo;}
}
#endregion Model
}
}