C# 修改DataTable列 类型 并从新赋值

DataTable dt = ds.Tables[]; DataTable dtResult = new DataTable();
//克隆表结构
dtResult = dt.Clone();
foreach (DataColumn col in dtResult.Columns)
{
if (col.ColumnName == "isCreditAll")
{
//修改列类型
col.DataType = typeof(string);
}
}
foreach (DataRow row in dt.Rows)
{
DataRow newDtRow = dtResult.NewRow();
foreach (DataColumn column in dt.Columns)
{
if (column.ColumnName == "isCreditAll")
{
newDtRow[column.ColumnName] = Convert.ToString(row[column.ColumnName]);
}
else
{
newDtRow[column.ColumnName] = row[column.ColumnName];
}
}
dtResult.Rows.Add(newDtRow);
} for (int i = ; i < dtResult.Rows.Count; i++)
{
if (dtResult.Rows[i]["isCreditAll"].ToString() == "false")
{
dtResult.Rows[i]["isCreditAll"] = "";
}
else
{
dtResult.Rows[i]["isCreditAll"] = "";
} }