private static void CheckFieldInfo(DataColumn dataColumn, string caption, I3DataTypeEnum dataType, int fieldLength)
{
switch (dataType)
{
case I3DataTypeEnum.sdtString:
dataColumn.DataType = typeof(string);
dataColumn.DefaultValue = "";
dataColumn.Caption = caption;
dataColumn.MaxLength = fieldLength;
break;
case I3DataTypeEnum.sdtInt:
dataColumn.DataType = typeof(int);
dataColumn.DefaultValue = 0;
dataColumn.Caption = caption;
break;
case I3DataTypeEnum.sdtDateTime:
dataColumn.DataType = typeof(DateTime);
dataColumn.DefaultValue = new DateTime(2000, 1, 1);
dataColumn.Caption = caption;
break;
case I3DataTypeEnum.sdtFloat:
dataColumn.DataType = typeof(double);
dataColumn.DefaultValue = 0;
dataColumn.Caption = caption;
break;
case I3DataTypeEnum.sdtBoolean:
dataColumn.DataType = typeof(bool);
dataColumn.DefaultValue = false;
dataColumn.Caption = caption;
break;
case I3DataTypeEnum.sdtStream:
dataColumn.DataType = typeof(byte[]);
dataColumn.DefaultValue = null;
dataColumn.Caption = caption;
break;
default:
dataColumn.DataType = typeof(string);
dataColumn.DefaultValue = "";
dataColumn.Caption = caption;
dataColumn.MaxLength = 50;
break;
}
}
///检查DataColumn的类型的长度是否与目标类型、长度一致 一致时返回true
private static bool CheckFieldInfoEqual(DataColumn column, I3DataTypeEnum dataType, int fieldLength)
{
switch (dataType)
{
case I3DataTypeEnum.sdtString:
if ((column.DataType == typeof(string)) && (column.MaxLength == fieldLength))
{
return(true);
}
break;
case I3DataTypeEnum.sdtInt:
if (column.DataType == typeof(int))
{
return(true);
}
break;
case I3DataTypeEnum.sdtDateTime:
if (column.DataType == typeof(DateTime))
{
return(true);
}
break;
case I3DataTypeEnum.sdtFloat:
if (column.DataType == typeof(double))
{
return(true);
}
break;
case I3DataTypeEnum.sdtBoolean:
if (column.DataType == typeof(bool))
{
return(true);
}
break;
default:
if ((column.DataType == typeof(string)) && (column.MaxLength == 50))
{
return(true);
}
break;
}
return(false);
}
/// <summary>
/// 检查字段是否存在
/// </summary>
/// <param name="dataSet"></param>
/// <param name="tableName"></param>
/// <param name="fieldName"></param>
/// <param name="fieldType"></param>
/// <param name="fieldLength"></param>
public static void CheckField(DataTable dataTable, string fieldName, string caption, I3DataTypeEnum dataType, int fieldLength)
{
bool have;
DataColumn testdataColumn = null;
try
{
testdataColumn = dataTable.Columns[fieldName];
have = testdataColumn != null;
}
catch (Exception)
{
have = false;
}
if (!have)
{
DataColumn dataColumn = new DataColumn(fieldName);
CheckFieldInfo(dataColumn, caption, dataType, fieldLength);
dataTable.Columns.Add(dataColumn);
}
else
{
testdataColumn.Caption = caption;
//主键不可修改
foreach (DataColumn col in dataTable.PrimaryKey)
{
if (col == testdataColumn)
{
return;
}
}
//数据类型和长度相同不用修改
if (CheckFieldInfoEqual(testdataColumn, dataType, fieldLength))
{
return;
}
DataColumn dataColumn = new DataColumn(fieldName + "2");
CheckFieldInfo(dataColumn, caption, dataType, fieldLength);
dataTable.Columns.Add(dataColumn);
string errString = "";
if (!CopyFieldValue(dataTable, testdataColumn, dataColumn, ref errString))
{
dataTable.Columns.Remove(dataColumn);
if (errString.Length > 1000)
{
errString = I3StringUtil.SubString(errString, 0, 1000) + "\r\n.........";
}
errString = "修改字段" + fieldName + "时出现错误！错误信息：\r\n" + errString;
MessageBox.Show(errString, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
dataTable.Columns.Remove(testdataColumn);
dataColumn.ColumnName = fieldName;
}
}
}
