Question

我已经查看了其他大约20个帖子以寻求帮助，但这些帖子似乎都不是我想要的。我在下面列出了所有内容。我试过让它等于我，但我仍然得到索引错误。我正在处理的数据库并不总是有信息。即使数据库中没有任何内容，我怎么能让它返回？

List<DataClassLibrary.LineData> ScaleGroup1and3 = list.FindAll(ld => ld.ScaleGroup == DataClassLibrary.ScaleGroup.GROUP_1 ||
                                                            ld.ScaleGroup == DataClassLibrary.ScaleGroup.BOTH);

    List<DataClassLibrary.LineData> ScaleGroup2and3 = list.FindAll(ld => ld.ScaleGroup == DataClassLibrary.ScaleGroup.GROUP_2 ||
                                                        ld.ScaleGroup == DataClassLibrary.ScaleGroup.BOTH);

    Label[] Group1and3ItemLabels = new Label[8] { L1, L7, L13, L19, L25, L31, L37, L43 };
    Label[] Group1and3BrandLabels = new Label[8] { L2, L8, L14, L20, L26, L32, L38, L44 };
    Label[] Group1and3RacksLabels = new Label[8] { L3, L9, L15, L21, L27, L33, L39, L45 };
    Label[] Group1and3CasesLabels = new Label[8] { L50, L51, L53, L55, L57, L59, L61, L63};

    Label[] Group2and3ItemLabels = new Label[] { L4, L10, L16, L22, L28, L34, L40, L46 };
    Label[] Group2and3BrandLabels = new Label[] { L5, L11, L17, L23, L29, L35, L41, L47 };
    Label[] Group2and3rackslabels = new Label[] { L6, L12, L18, L24, L30, L36, L42, L48 };
    Label[] Group2and3CasesLabels = new Label[] { L49, L52, L54, L56, L58, L60, L62, L64 };

    for (int i = 0; i <= ScaleGroup1and3.Count; i++)
    {
            Group1and3ItemLabels[i].Text = list[i].ItemCode;
            Group1and3BrandLabels[i].Text = list[i].BrandCode;
            Group1and3CasesLabels[i].Text = list[i].CasesRemaining.ToString();
    }

    for (int i = 0; i <= ScaleGroup2and3.Count; i++)
    {
        Group2and3ItemLabels[i].Text = list[i].ItemCode;
        Group2and3BrandLabels[i].Text = list[i].BrandCode;
        Group2and3CasesLabels[i].Text = list[i].CasesRemaining.ToString();
    }

Answer 1

将<=更改为<，以便在DB未返回任何内容时不执行循环：

for (int i = 0; i < ScaleGroup1and3.Count; i++)
...
for (int i = 0; i < ScaleGroup2and3.Count; i++)

实际上你需要更改它们，因为列表中的索引是从0开始的，这意味着元素

ScaleGroup1and3[ScaleGroup1and3.Count]

不存在。

Answer 2

确保ScaleGroup1and3和ScaleGroup2and3 不超过8个元素，for声明应如下所示：

for (int i = 0; i < ScaleGroup1and3.Count; i++)

for (int i = 0; i < ScaleGroup2and3.Count; i++)

指数超出范围。必须是非负数且小于集合的大小

2 个答案: