序列化时，强类型数据集字符串值为空

问题描述

我有一个强类型的数据集，我们将其中一列从int32更改为string.现在，当数据集到达中间层时，该列为空.

我在调用中间层之前检查了该列，该值很好.一旦到达中间层，我将再次检查它，并且该值现在为null.所有其他列都可以正常工作-包括int32，字符串和日期，仅此一列，我们将类型更改为string on.

有任何想法吗?

I have a strongly typed dataset that we changed one of the columns from int32 to string. Now when the dataset reaches the middle layer, the column is null.

I checked the column right before we call the middle layer and the value is fine. I check it again as soon as we reach the middle layer and the value is now null. All other columns work fine - including int32, string and date, its just this one column that we changed the type to string on.

Any ideas???

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