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DataColumn[] columns = new DataColumn[1];
columns[0] = dt.Columns["id"];
dt.PrimaryKey = columns;
2、不存在的话,创建一个唯一字段:
//自增ID
DataColumn dcAutoId = new DataColumn("id", typeof(int))
{
AutoIncrement = true, //自增
AutoIncrementSeed = 1, //起始值1
AutoIncrementStep = 1, //步长1
AllowDBNull = false //不为空
};
dt.Columns.Add(dcAutoId);
DataColumn[] keys = new DataColumn[1];
keys[0] = dt.Columns["id"];
dt.PrimaryKey = keys;