[英]DataContractSerializer - DBNull.Value
From my WCF client I call a method to the service. 从WCF客户端,我调用服务的方法。 As an argument I pass an array of bits which is a serialized object of my custom class:
作为参数,我传递了一个位数组,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;
}
}
The problem is that the arrays in the list Parameters can contain DBNull.Value, which is not supported by the DataContractSerializer by default. 问题是参数列表中的数组可以包含DBNull.Value,默认情况下DataContractSerializer不支持。 If I add DBNull to the supported types, the code slows down a lot, so I can't solve it this way.
如果我将DBNull添加到受支持的类型,则代码会减慢很多速度,因此无法以这种方式解决。 How can I make it work?
我该如何运作?
I'm not sure this is what you want but it might help. 我不确定这是否是您想要的,但可能会有所帮助。 with this method you can check a
DataSet
for null values and replace them: 使用此方法,您可以检查
DataSet
中的空值并将其替换:
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;
}
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