问题描述

报错：未将对象引用设置到对象的实例。下面是代码

public class Temporary
{
//public string Query_NAME { get; set; }
public long Te_TC { get; set; }
public long Te_MC { get; set; }
public long Te_QC { get; set; }
public long Te_WC { get; set; }
public long Te_CC { get; set; }
public long Te_EC { get; set; }
public long Te_PC { get; set; }
}
private DataServiceCollection temporary;

    public DataServiceCollection<Temporary> AllTemporary
    {
        get { return temporary; }
        set
        {
            if (temporary != value)
            {
                temporary = value;
                this.OnPropertyChanged("AllTemporary");
            }
        }
    }

    public object QueryInventoryInfo(string areaId)
    {

        if (string.IsNullOrEmpty(areaId))
        {
            areaId = "";
        }
        string locType = "2";
        for (int i = 0; i < Areas.Count; i++)
        {
            Temporary tem = new Temporary();
            tem.Te_TC = this.WMSServiceContext.MD_LOCATION.Where(c => c.LOC_TYPE != locType && c.AREA_ID.StartsWith(areaId)).LongCount();
            tem.Te_MC = this.WMSServiceContext.MD_LOCATION.Where(c => c.LOC_TYPE != locType && c.AREA_ID.StartsWith(areaId)
                                                                     && c.STATUS.Contains("m")).LongCount();
            tem.Te_QC = this.WMSServiceContext.MD_LOCATION.Where(c => c.LOC_TYPE != locType && c.AREA_ID.StartsWith(areaId)
                                                                     && c.STATUS.Contains("q")).LongCount();
            tem.Te_WC = this.WMSServiceContext.MD_LOCATION.Where(c => c.LOC_TYPE != locType && c.AREA_ID.StartsWith(areaId)
                                                                     && c.STATUS.Contains("w")).LongCount();
            tem.Te_CC = this.WMSServiceContext.MD_LOCATION.Where(c => c.LOC_TYPE != locType && c.AREA_ID.StartsWith(areaId)
                                                                     && c.STATUS.Contains("c")).LongCount();
            tem.Te_EC = this.WMSServiceContext.MD_LOCATION.Where(c => c.LOC_TYPE != locType && c.AREA_ID.StartsWith(areaId)
                                                                     && c.STATUS.Contains("e")).LongCount();
            tem.Te_PC = this.WMSServiceContext.MD_LOCATION.Where(c => c.LOC_TYPE != locType && c.AREA_ID.StartsWith(areaId)
                                                                     && c.STATUS.Contains("p")).LongCount();
            if (tem != null)
            {
                this.AllTemporary.Add(tem);
                                    //此处报错
            }
        }
        return AllTemporary;
    }

解决方案

错在哪一行就检查那一行上的几个变量，看哪个是null

解决方案二：

AllTemporary没初始化？

解决方案三：

你应该先判断new 成功没有，new 返回的是指针，你的好像不是Temporary tem = new Temporary（）；-->
Temporary *tem = new Temporary();??