数组越界

Question

dr["scompanyname"] = dt_DWML.Select("scompanycode='" + arrSrcComp[i] + "'")[0]["scompanyname"].ToString();
为啥这句老显示数组越界呢？
还有就是根据表的编码查询对应的名称语句不是这样写吗？
各位大鸟们帮下忙撒！！！

Answer 1

dt_DWML.Select("scompanycode='" + arrSrcComp[i] + "'")
你这个得到的是0条记录，所以后面[0]取第一条数据肯定提示越界

Answer 2

dt_DWML.Select("scompanycode='" + arrSrcComp[i] + "'")
这个很有可能为null

Answer 3

要先判断下dt_DWML.Select()的结果(即Count > 0) 再去取值,否则直接取[0]在Count=0时肯定会报数组越界的异常的

Answer 4

//001;002;003
                string[] arrSrcComp = sSrcComp.Split(new Char[] { ';'});                                
                for (int i = 0; i < arrSrcComp.Length; i++)
                {
                    DataRow dr = dt_SrcComp.NewRow();
                    dr["scompanycode"] = arrSrcComp[i];
                    dr["scompanyname"] = dt_DWML.Select("scompanycode='" + arrSrcComp[i] + "'")[0]["scompanyname"].ToString();                    
                    dt_SrcComp.Rows.Add(dr);
源代码是这样的，我就是想获得对应单位编码的单位名称

Answer 5

 这是那方法：
错误信息:;索引超出了数组界限。
private void cmb_HZFA_SelectedIndexChanged(object sender, EventArgs e)
        {
                string sSrcComp = dt_HZFA.Rows[cmb_HZFA.SelectedIndex]["SSRCCOMPCODE"].ToString();
                string sDesComp = dt_HZFA.Rows[cmb_HZFA.SelectedIndex]["SDESCOMPCODE"].ToString();
                this.UIP.FrameManager.ShowInformation("xx", sSrcComp + "||" + sDesComp);               
                reloadSrcComp(sSrcComp);
                reloadDesComp(sDesComp);        
        }        private void reloadSrcComp(string sSrcComp)
        {           
            this.Grid_SrcCom.Clear();
            this.dt_SrcComp = this.dt_DWML.Clone();
            this.Grid_SrcCom.DataSource = dt_SrcComp;
            if (sSrcComp.Trim() != "")
            {
                //001;002;4LZTLJ000
                string[] arrSrcComp = sSrcComp.Split(new Char[] { ';'});                                
                for (int i = 0; i < arrSrcComp.Length; i++)
                {
                    DataRow dr = dt_SrcComp.NewRow();
                    dr["scompanycode"] = arrSrcComp[i];
                    dr["scompanyname"] = dt_DWML.Select("scompanycode='" + arrSrcComp[i] + "'")[i]["scompanyname"].ToString();                    
                    dt_SrcComp.Rows.Add(dr);
                    Grid_SrcCom.Cols["scompanycode"].Caption = "单位编码";
                    Grid_SrcCom.Cols["scompanycode"].Width = 120;
                    Grid_SrcCom.Cols["scompanyname"].Caption = "单位名称";
                    Grid_SrcCom.Cols["scompanyname"].Width = 250;
                }                              
            }           
        }        private void reloadDesComp(string sDesComp)
        {
            this.Grid_DesCom.Clear();
            this.dt_DesComp = this.dt_DWML.Clone();
            this.Grid_DesCom.DataSource = dt_DesComp;
            if (sDesComp.Trim() != "")
            {
                    //hz1                           
                    DataRow dr = dt_DesComp.NewRow();                                                   
                    dr["scompanycode"] = sDesComp;
                    dr["scompanyname"] = dt_DWML.Select("scompanycode='" + sDesComp + "'")[0]["scompanyname"].ToString();                                        
                    dt_DesComp.Rows.Add(dr);
                    Grid_DesCom.Cols["scompanycode"].Caption = "单位编码";
                    Grid_DesCom.Cols["scompanycode"].Width = 120;
                    Grid_DesCom.Cols["scompanyname"].Caption = "单位名称";
                    Grid_DesCom.Cols["scompanyname"].Width = 250;
            }           
        }

Answer 6

就是dr["scompanyname"] = dt_DWML.Select("scompanycode='" + arrSrcComp[i] + "'")[i]["scompanyname"].ToString(); 的提示

Answer 7

if(arrSrcComp.Length>i)
dr["scompanyname"] = dt_DWML.Select("scompanycode='" + arrSrcComp[i] + "'")[0]["scompanyname"].ToString();
dt_DWML.Select("scompanycode='" + arrSrcComp[i] + "'")[0]是否为null

Answer 8

你最好分开写好一点:
dr["scompanyname"] = dt_DWML.Select("scompanycode='" + arrSrcComp[i] + "'")[0]["scompanyname"].ToString();改成:DataRow[] result = dt_DWML.Select("scompanycode='" + arrSrcComp[i] + "'");
if(result!=null && result.Length>0) //做匹配结果判断
  dr["scompanyname"] = result[0]["scompanyname"];
else
  dr["scompanyname" = string.Empty;

Answer 9

 dr["scompanyname" = string.Empty;少了一个"]"

Answer 10

if(!isnullorempty("string"))
{
}