从我的WCF客户端,我调用一个方法来服务。作为参数,我传递一个位数组,这是我的自定义类的序列化对象:
public class MySqlCommand
{
public string CommandText;
public List<object[]> Parameters;
public MySqlCommand()
{
Parameters = new List<object[]>();
}
public static MySqlCommand GetSQLCommand(string CommandID)
{
MySqlCommand command = new MySqlCommand();
command.CommandText = CommandID;
return command;
}
}
问题是列表Parameters中的数组可以包含DBNull.Value,默认情况下DataContractSerializer不支持。如果我将DBNull添加到支持的类型,代码会减慢很多,所以我无法通过这种方式解决它。我怎样才能使它发挥作用?
答案 0 :(得分:1)
我不确定这是你想要的,但它可能有所帮助。使用此方法,您可以检查DataSet
是否为空值并替换它们:
public static DataSet DBNull(DataSet dataSet)
{
try
{
foreach (DataTable dataTable in dataSet.Tables)
foreach (DataRow dataRow in dataTable.Rows)
foreach (DataColumn dataColumn in dataTable.Columns)
if (dataRow.IsNull(dataColumn))
{
if (dataColumn.DataType.IsValueType) dataRow[dataColumn] = Activator.CreateInstance(dataColumn.DataType);
else if (dataColumn.DataType == typeof(bool)) dataRow[dataColumn] = false;
else if (dataColumn.DataType == typeof(Guid)) dataRow[dataColumn] = Guid.Empty;
else if (dataColumn.DataType == typeof(string)) dataRow[dataColumn] = string.Empty;
else if (dataColumn.DataType == typeof(DateTime)) dataRow[dataColumn] = DateTime.MaxValue;
else if (dataColumn.DataType == typeof(int) || dataColumn.DataType == typeof(byte) || dataColumn.DataType == typeof(short) || dataColumn.DataType == typeof(long) || dataColumn.DataType == typeof(float) || dataColumn.DataType == typeof(double)) dataRow[dataColumn] = 0;
else dataRow[dataColumn] = null;
}
return dataSet;
}
catch (Exception ex)
{
return dataSet;
}